It depends on where you fly and what your goals are. For international travel, staying with AF is probably your best bet. If you go NW, you can get upgraded on your flights, but then you'll use all your miles. AZ might be ok, but you already have a load of AF points and I don't see what advantage that would give you. I'd stick with the AF miles to try to get as many in that account as you can.

Enjoy, err, Romania.