If you can have only one Part 15: Summer Mordred (Rider) Vs Anne & Mary (Rider)

In my experience, Mary and Anne are capable of monstrous damage in the right conditions, but at the same time, these situations are incredibly risky. She might die before she can unleash her extremely powerful NP and to top it off, her crit gain is not exactly the best and neither is her NP gain due to low hit counts, requiring her team to give her stars and charge her NP while also keeping her from dying immediately. When the cards are played right, she is capable of absolutely demolishing anything in their path with a single burst, but these conditions require her to be literally on the edge of dying.

Mordred's edge differs from Mary and Anne in that instead of a single nuke NP burst, she relies on spamming an otherwise weaker NP to an extent that is uncontested. As a Rider, her star absorption can allow her to take in stars and fill her NP gauge very quickly with an NPAA chain. Her NP gain skill is tied with a Guts and heal making her quite durable, and she possesses an Arts steroid for three turns to increase her NP's strength and frequency. Her NP is weak as an AoE, but possesses an RNG chance to reduce NP charge for the enemy team. Mordred may operate efficiently with a good team, but otherwise falls short compared to other AoE riders in the game, such as Santa Alter.

Overall, Anne and Bonny may be better for bosses, but I'd prefer Mordred because her playstyle requires less risk and can be relied on to put out damage consistently.

Gotta go with Mordred on this one. And, to be honest, I don't really tnink I have to explain a lot here like my other answers.

Anne and Mary have a very simple niche. A super powerful one-turn burst of damage. With skills dedicated to three turns of star gen up, plus one turn of crit up (+100%), crit absorb up, and ATK up , coupled with her naturally high star weight, the pirate duo deals insane amounts of damage when coupled with the right support. Their NP also has the unique effect of receiving a massive boost in damage based on how low their HP is. At max overcharge and at 1HP, they can deal an additional 2000% damage on top of the already hig NP modifier due to being an ST type NP, further boosted by high NP levels and the interlude.

Unfortunately, such power comes at the cost of longevity. Unless they receive healing immediately after their NP from another NP (Nightingale, Medea Lily, Irisviel) then they could very well die on that same turn. Even if they survived, without someone to apply the Guts status on them, it's highly unlikely they will survive until the next use of their NP.

Mordred, as everyone knows, is mostly a one-trick pony. But it's a trick she does very well. And that's to spam her NP over consecutive turns. With a high enough level on her first skill coupled with atk and/or art buffs (an NP gain buff doesn't hurt either) she'll be racking up a massive return with each use of her NP, often more than enough for another shot and another, and another.

While I don't normally favor Servants whose main claim to fame is their ability to farm, Anne and Mary's gimmick simply isn't that useful outside of very specific situations that also require precise timing and gratuitous amounts of luck.

While I think Anne and Mary are really neat, I don't like their rider form very much. They're all about gathering crit stars, which is all fine and dandy, but they aren't exactly unique in that aspect, especially in the Rider Class. Their NP is a cool idea, but it's incredibly difficult to use it effectively, unless you can give them a targetable guts, or some major heal, they will likely die soon after.

Mordred on the other hand is an incredible farmer. She has an NP battery/guts skill and an evade, on top of a great arts up. She doesn't do much outside of farming, but with the proper set up she can back to back NP, which makes her a top tier farmer. Since she is the only rider with a damaging AOE arts NP (in NA) she's incredibly unique, which further pulls things in her favor.

Surf Mo easily.

This isn't really a question, especially after one tried out Rider Modred surfing for 20 consecutive turn in the Valentine challenge quest (search for it, trust me, u would love her once u tried that out). Having THE MOST ABSURD NP gain (around 31.95 without any buff in 1.0 NP recovery, nearly double of the second highest now in NA 17.70), she can literally spam NP from the start to the end of a battle with double tamamoo, Nero Bride or in the further, Paracelsus, despite various nerfs the game has made on her. However, to allow her to be usable in stages with higher HP, a higher NP level is needed, although NP1 is enough to just farm for QP (which is around 90% of the game).
Before Skadi is out, she is the most efficient event farmer in a lot of event stages since only Rider Modred is required not to bring event CE (if the CE does not include starting NP, of course), this massively increases the farming experience, especially for event with lottery.
She is one of the best SR in the entirely game and excel in her area where no servant is even on par with her right now and there is simply no need to compare with other SR. Therefore, I strongly feel that Rider Modred is just too strong not to be picked over Anne & Mary (Rider).

Rider Mordred all the way because of her NP spam capabilities as many have already pointed out. Unfortunately her damage output is laughable but otherwise she'd be too op I guess.

There is simply no point in using Anne & Bonny as long as everyone has their own welfare NP5 rider Kintoki.

Summer Mordred easy. She has no direct competition. Meanwhile, anne mary goes up against welfare kintoki and even free ushi. AM still has uses blowing up a target, but she requires a lot of management and resources. While her skill cd may be ok, the skills themselves are in need of strengthening. There are servants with her entire skill kit basically rolled into one skill.