Hand drawn or 3d. Never "AI" graphics, unless the ai is used for very minor background stuff. AI has way too much fucked up things you notice if you really pay attention so they break the immersion.
Personally, I prefer hand-drawn art, but any of the three can be great—as long as there's real effort behind it, not just something slapped together on the first try
Personally I like the hand drawn games a lot more, just seems like more effort and are usually a higher quality. But curious of everyone else's opinion.?
I will always prefer handrawn over everything else, although I also really like 3d art where the characters are stylized (Honkai, ZZZ, etc.). 3d characters with realistic looking faces and proportions look ugly to me, and 90% of AI art I see always has something off about it.
I like both 3d and hand drawn, Ai assisted is fine as well. For pure Ai art though, as long as it's consistent and the deformities are kept to a minimum.
I feel like hand drawn is objectively the best, although probably has the highest workload too so (arguably) the most likely to be abandoned. Could be interesting to see some stats on that.