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Just buy whichever one you like.
It's not like any of them are actually bad. Go look at videos or just pictures and you'll get an idea of what they're like.
So if you like the Marvel Legend one, what does it matter if it's a reused body that's been reused 10 times? You liked what oyu saw, so it shouldn't matter.
Articulation is pretty much the same across all the lines except for Yamaguchi's. So it's like 10%-5% difference in range of motion between the ilnes and Yamaguchi's is like 20% better.
Personally, i went for Mezco's Deadpool, because of how it looks and the accessories it came with.
For most other characters, i buy a mix between Mafex, Marvel and Mezco figures. Revoltech and Figuarts have iffy or awful sculpts most of the time. Figuarts and Figma usually does only movie stuff, so who cares.