There is, but they aren't earth shatteringly different. The D-11 turns the best and handles the best at low speed (although you want to avoid getting too slow in any Jug). The D-25 is the slowest of all but accelerates better than the D-11 and has the best overall ord loadout. The D-30 is about as fast as the D-11, accelerates the best, climbs the best, and it's got a dive brake which is handy. All of them handle best at high speed. I haven't flown Jugs for a while, but I think the D-11 is best if you just want a fighter, but take a 25 or 30 for ground attack.