Lancer or rider
Lancers I own are scathatch, tama lancer and karna
Riders I own are ozy and Quetz
What banner would you prefer to roll in if you were in my situation?
why is it between those two only?
I would probably go with lancer because the chance is higher for you to roll something new. Or you can go for Drake hoping to get an AOE rider.
However, you already have the best of their respective classes. The GSSR will only give you new low-tier servants or high-tier dupes so I actually wouldn't roll for either.
Id roll on other banners but Every other class I own the ssrs or the risk of a dupe is too high
Probably you should ask yourself which servants you don't mind getting. Purely from a gameplay standpoint, only Drake would be a good addition to your current roster. Latoria can be useful due to her 50np charge but her damage is a bit underwhelming at np1.
Personally, I would go for Rider. Besides Drake, I don't mind np2 Ozy or Quetz as they're top-tier servants and used frequently.
Honestly neither. You already have some of the best servants in those classes. So I'd say anything else aside from those two classes. Depending on what you already have.
