The best fun is finding out for yourself.
Anyway, everybody will think about this differently, but Im sure you thought of that when calling this a poll. In Hyperlobby most pilots seem to agree that in ABA the best planes are: F15E, F111, F22, but in ABA you will mostly fly only with iron bombs, so what you noticed about the F15E is no problem there.
For missions there are a lot of good planes:
Attack: A-10, F/A-18D (good loadout, but too slow, at least in stock FA), Su-34. Fighter: RafaleC, F-22, EF2000, Su-33, Su-35 Bomber: B-52(for cruise missiles (use AGM-84A/E)), B-2(irons bombs)
Enjoy your flying. Flying in multiplayer adds so much to the experience, especially in Cooperative missions.
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