With the exception of battle gaia I have every version of bruticus.
There is a mould change for blast off/movor, from G1 up until rid the mold has a pointed nose and from universe on wards the nose is rounded.
I have sonokongs valdigus and there is nothing wrong with it, its a more screen accurate version than rid's ruinations too. Gps is not a problem, I must have transformed it 50 times over the last 7 years so don't worry about that.
G1 bruticus has a problem with its chest shield popping off when you try to move the arms but if its for display then it shouldn't be a problem. G2 onwards fixes this problem.
I can't comment on the encore version, mine is still sealed but I have heard that it is a bit dodgy.
My universe mega octane's legs are a little loose, I don't know if thats a problem with that release or just mine but it is something to look out for.
The arctic camo runation is nice and the colours look are uniform and look really good, if you are not particularly attached to the bruticus or ruination characters in their show colours then I would get this version
Hunting:
Beast Wars/Machines/Neo/Second