Half of these answers are either about Ninjask, or don't even apply to the actual question, so I'll try to look over each Bug/Flying type:
The first of them all. Bad stats in most aspects, but has a small niche for powdering with Compoundeyes. Fairly unorthodox, compared to Venomoth, but you can use it if you want.
A great sweeper that is as straightforward as all sweepers. Just use Technician on it, put some decent STAB and coverage on, and let it rip things apart.
It's an inferior Butterfree, and probably the worst Bug/Flying type there is.
My favorite Pokemon, and the Bug/Flying type with the best coverage available. Water-type movepool, Bug-type movepool, and a few tutor moves with Quiver Dance/Baton Pass, make this guy a multi-use wonder in the lower tiers!
Yeah, just read everyone else's opinions.
Also pretty mediocre. The mixed Sweeping stats are good, but it's way too slow. Unless you can baton Pass Agility onto it, don't even try using it.
An ironic Pokemon through and through. Why make it bulky if it can't wall anything because of a bunch of weaknesses? People seem to think it's good, but really, it's pretty average.
A formidable Bug/Flying type that has its obvious flaws, but enough assets to keep it strong. A fair movepool paired with healthy stats makes for a unique sweeper with its quirky abilities.