The WR M 2021 is according to the reviews so far, almost the same as the Tornado V2, just a little heavier, a few dollars pricier, and apparently noiser but it seems better in reverse corner-cutting and it allows you to get to the springs. There is a review from SpeedCubeShop comparing these two (but not with the Gan356 M).
I actually had tornado v2 in my mind too. But it has a rivetted screw and if I ever need to lube the spring and screw, it's just gonna make it a lot harder. The lockup and corner-cutting problems that many others told also kinda took me away from tornado v2. I saw your thread on it BTW. It's a nice one. I'm not a fast cuber so maybe yeah tornado v2 seems good too. I've heard it feels a lot like the GAN puzzles. But I guess if I'm spending $25 I might as well spend a bit more and buy avoid the lockup and corner-cutting issues.