>>6610677>>6610688>>6613926>>6612951I also have both. My Jizai's joints are uncomfortably tight (in the peg area) and so it's kind of a chore to pose him, whereas my Jason one is really easy. This is probably just a case-by-case basis thing and will vary though. Or hell, it's probably just because I've owned my Jason one longer and like, broke it in.
Both have sort of weak/slightly loose ab crunches, a consequence of one tiny unratcheted joint supporting the entire upper body. It's not a huge deal though, and Pledge might be able to help a little.
Jizai is SLIGHTLY taller, but also feels SLIGHTLY more brittle to me. Probably due to the slightly thinner and more delicate sculpt. Jason one is a little bit chunkier and feels more durable to me.
I would also consider what you're buying it for. The Jizai is a really good "horror" skelly--it's really spooky looking, it has good build potential due to the extra parts, and the standard headsculpt looks like a gashadokuro, which is cool as heck. But the Jason one definitely has more personality. Even though it only has one head, it almost seems capable of emoting--look around at various pics of it and its face seems to communicate mirth, sadness, anger, joy, etc. depending on the situation. I tend to have more fun with it for that reason. The Jizai's spooky headsculpts seem rather "blank" and don't communicate any particular emotion to me.