>>5261121I don't know, between the revo and the figure arts I can't say I'm really leaning toward either.
Revo is known for their ridiculous dynamicism when it comes to poses, but it's Ultron, how ridiculous is he going to need to be posed? I don't recall the live action Ultron moving in any exotic way either, so the need for revo joints is kind of pointless to me. The detailing doesn't seem to be that great either.
The Figurearts looks ok from what I've seen, but I haven't seen enough to make judgement on it further.