For perks I dont think it matters which one you launch under. For points/ranking it does matter. If you bomb GVs in fighter mode you dont get the hit% for damage, nor does the kill count toward score. It also knocks down your kill per sortie and and stuff, because if your counting GV kills in fighter mode it doesnt add them in so in essence you could kill 3 GVs, land, get your name in lights, but the kill will just be added to the total, but not to the scores. As far as the k/d, and k/s you wasted a trip because those wont be tallied.
Thats why some guys wont kill ack to set up a vulch. They upped in fighter mode and it will hurt their numbers.
In attack more it all counts toward score/rank... bomb damage, bullet hit, rocket, everything. Of course if you only fly attack mode all the time you fight scores/rank suck and that pulls down your over all score/rank.
I think the score/rank system was set up so you have to participate in a bit of everything to rank high over all. There are some tricks to gaming the system and some guys only play the game that way.
In the end its all in how you want to play. If your interested in improving your aim and so watch the hit% just shoot at planes in fighter mode.
Of course I could be way off and Lusche will be along shortly to straiten us out
