Currently I don't have a 5* rider and a 5* saber and my only 5* assassin is jack. But knowing that gramps and musashi are coming and quetz banner is currently active who should I choose?
I'd throw a 30 at Quetz and see what happens. She was the rider that finally joined my team to round it out. Just kinda depends on which of the three you would like and what you have to roll with. They're all three worth rolling for, but since you have Jack, gameplay wise I'd say Quetz or Musashi. Or do both. Or all three. No one says you have to all in one servant.
Musashi. There are not many decent non ssr sabers while there are plenty of decent non ssr riders.
You may also want to consider waiting for the GSSR next month. It's paid quartz only but it is a guaranteed 5*.
Under Saber the possibilities are OG Altria, Altera, and Mordred. All are AOE though and there are much better options for Saber.
Riders have Ozy, Quetz, Drake, and, unfortunately, Medb. Ozy and Quetz are great, Drake is OK for farming and Medb is mostly for an anti-male niche. So, in my eyes, it's a 50/50 chance for a good multi-role ST Rider.
This way you have a much higher chance for Quetz then you can roll for Musashi or Hassan.
Jack is pretty much the best assassin in the game, with King Hassan (and Cleo?) being the only one(s) to even come close to giving her competition. You don't need King Hassan, though there's no harm rolling for him if you like him.
Musashi is probably a better bet for you if you don't have a 5* saber, though if I were you I'd just wait till February to roll Okita.
