Looking at your flying, if all of it is on OW carriers then you should make BA Gold or AA EXP.

Each program has its own Pros and Cons, only you can really decide which is more appropriate for you. There is no straightforward answer. If you are able to book Premium Economy fares then BAEC may be better for the ability to upgrade to CW. Else, AA may be better with the System Wide Upgrades (although you'd need to fly AA metal TATL).