Which guaranteed 5 star gatcha should i roll?

I would do the one with the Riders/Casters/Assassins, I personally am F2P so can't do the roll but I've heard from others that when deciding what to roll it's either rolling for a servant you want or secondly what's better.

I'm pretty sure more of the servants in the Rider/Caster/Assassins gacha are better. Thus it's the better pick assuming you are in it for gameplay.

Probably just wait for another reply to see what others also think before deciding. But remember in essence it's just RNG, it won't matter whatever one you pick if luck strikes you down. (But good luck :)

The Cavalry banner has better servants. If you like them equally, better to defer to cavalry.

Recommend the cavalry banner as it gives you the highest chance to get self sustaining useful units until even harder challenge quests. Only terrible ones being mebd, nightingale to some extent. While all the others are generalists like drake who work wonders for farming and she crits all the time. Tier 1 like CU Alter, Waver, ozy and jack who are the best in their class. And Niche ones like xuanzang, vlad and tamamo who are still great

Go for Cavalry and pray hard that you don’t get medb. Everyone is good in cavalry except for medb. Some are a little harder to use *cough* Nightingale *cough* but it is still a 9/10 chance to get a good SSR.