Current top tier bombers

[Antonio]

After the changes I did half a year ago they're all pretty much balanced for the role they do.

Cap fighting = any bomber, heavies are the best in terms of dps but worst in survivability. If it's caps only you should always use heavy bombers.
Piracy = loadout dependent, hellfires are a mandatory and any sort of efficient guns for maximum dps (SNAC is bad for piracy, novas are alright but situational, new bombs seem really good)
Group fights = highly situational, if you mean a fight where all classes are fighting each other then light bombers will survive the longest but they have the lowest dps.
Duels = doesn't matter, any bomber can beat any bomber, although heavies are much easier to hit so anything that's not a heavy or a big medium bomber is alright. Having an extra gun also helps, which makes BHG or Core bomber one of the best.
Noob friendly bomber = a heavy bomber shooting novas at caps at safe distance.
MLG_420_SNACIT = get good. Any bomber works. Watch my montages and the angle I approach the targets.

Keep in mind that this is all in regards to the SNAC still being in the game. From what I've heard it'll get removed in the future, and if that happens I can see heavy bombers becoming much more stronger once they can't get instakilled anymore.

Edit: I'll throw my opinion on the best in each subclass:
The best light: Cougar
The best medium: Kaichou
The best heavy: Nanda Devi

---

SNAC Montage Part 1 | Part 2 | Part 3 | Part 4 | Part 5 | Thruster SNAC