Bedivere NP5 or Lancelot NP2?

They're a bit different in terms of roles though I'm personally leaning on Lancelot due to his more general usage in any sort of battle thanks to his star gen and crits. His crits can either function for himself or be shared with another crit-centric servant as long as you don't use his 2nd skill. Plus his 4* stats advantage doesn't hurt too.

Bedi hits hard though for sure with his NP, especially since you have him at NP5. Definitely a good nuker for boss battles or other spongy enemies.

There's still 5 days of Nerofest so at the very least I think you can actually raise them both to max ascension right now, especially since their mats are abundantly available in the lotto at the moment, as well as drops and the shop.

Edit:

Oops I forgot to clarify if that Lancelot is Berserker Lancelot and not Saberlot. Zerk Lancelot is someone you'd want if you want to farm and clear waves fast, but you can raise Bedi instead for bosses and tough fights.

I, too, am assuming OP means Saberlot, since Zerkerlot and Bedivere fill two very different roles.

In which case, I also lean towards Lancelot as he has a bit more versatility than Bedivere does. Outside of delivering his one, powerful NP, Bedivere doesn't offer much except for some minimal, 1-turn team support. Lancelot can deliver hard, fast crits and generate stars.

If you’re referring to Saberlot, I would put the mats towards him first. His ability to handle all facets of critting all on his own makes him valuable in any battle. He can generate the stars, absorb then and boost his Crit Damage. Plus his first skill has the added bonus of giving him a size able NP gauge boost. His NP can hit hard, especially in an Arts team and has a decent added effect of increasing the targets damage taken. His 4* stats give him the bump over Bedivere as well. Saberlot is one of the best 4* Sabers, and even though Bedivere is at NP5 and is a good servant in his own ways, I don’t think he has the party range or damage potential to bring him that close to Saberlot. As the previous reply mentioned, if you don’t activate his second skill, then all those stars can be used for another party memeber. Thanks to his skill set, two Quick cards and high hit counts, it’s a good amount of stars!