Waver or Hans for an arts crit team with Lancelot saber?

Tamamo is the best option, but if it’s a choice between Hans and Waver, I’d pick Waver. He has much better survivability, his attack and defense buffs are stronger (30% at level 10 vs. 20% for Hans at 100% NP charge), and (arguably) has much better uptime for his buffs than Has does. Even at NP5, Hans has only a 64% chance of buffing both Lancelot’s attack and defense. In my experience, Hans is very dependent on his Rapid Casting skill to use his NP, so he’s using his NP every six turns, maybe five if you’re lucky; Waver’s skills also have a six-turn cooldown at level 10. Yes, Hans is a better crit buffer and can heal Lancelot, but that doesn’t outweigh the strength and consistency of Waver’s buffs and his 50% NP charge on demand.

Well depends on what level his 3rd skill is. If its maxed then I would think you can forgo hans for the star generation. Then there is 2 ways to use lancelot either a arts/np spammer or buster and crits. If you are trying to spam his np I would go for tamamo and waver because of fox's wedding and charge help from waver. If you are going for the critical monster I would recommend bringing hans and waver since they can boost his critical damage and add a bit of ultilty.

Keep in mind i'm assuming that you have lancelots 3rd skill maxed for the crit star generation, which with hans basically eliminates the need for any critical engine.

From what I gathered from the post you have waver right? just making sure if not then I recommend going for critical buster options since you can use a support waver.

Tl;Dr: If his 3rd skill is maxed and you own waver, use a support tamamo since he can both be a np spammer and a crit machine. If it isn't maxed than either chose hans or tamamo, hans for criting and tamamo for np spamming.

Edit: Got distracted from the questions and as I said you need a way to generate stars for saberlot so again if his 3rd skill is at a high level go for waver and tamamo.

Both