There are a lot to choose from but I have been chewing through credits quite quickly on Kling 2.6 and that's a moderately priced one. The wall I have hit with all of those tested so far is that there's no telling the AI that an Ork's tusks are part of the lower jaw and should move in conjuction with it. :D
So I may have to admit defeat and drop the tusks.
I've also been playing with LTX 2.0, the open source version. It's written to understand cinematography instructions instead of "prompt trickery" so you instruct it as though you were passing on the information to a real camera crew. So the 2nd video is after quite a lot of testing of that, twiddling the knobs and flicking all the switches underneath after reading the documentation...
That said, it's done its fair share of dumb things with little more than a seed change. ;)