Welcome to ft notfrequentenough

I suggest you read through the existing thread re-posted-deciding-oneworld-frequent-flyer-program-help-here (it's a 'sticky' thread at the top of the first page of the oneworld forum

The considered opinion is that you should decide on one frequent flyer programme for each of the alliances you're likely to fly (Oneworld, Star and SkyTeam (aka LeftoverTeam)). This is because in general you can earn miles to your chosen programme by flying on any of the airlines in the alliance (there are exceptions to this - it depends on the booking class of the tickets you purchase)

Which programmes are best for you depends on what you want out of them
It sounds like you are after redemption flights - in Oneworld, the AA programme is considered the best for this; but again it will depend on which Oneworld airlines you fly and the booking classes of the tickets