My favorite is the Mantis.
It’s tough. I really enjoy using the Ghost Ultra. In early warzone it is something to be reckoned with.
Ultra Ghost
Hannibal Wasp. I Also Like Jumping On Them To Hijack The Pilot To Death.
Gotta say, in Firefight I have been loving the Wasp and its sub-variants. Really is a lot of fun raining death from above, even when being torn to shreds by Covenant/Prometheans. Just wish I got more of them in my REQ Packs.
There’s so many to choose from.But for me.I tend to lean toward’s the AA Wraith.Everything else is a very close second.
The phaeton helios is gotta be #1 if u can use right its hard to take down and you get 40+ kills with it easy. The only $h!++y thing about it is you hardly get in in the req packs. The other day i open 100 gold reqs from the everything i had saved up and only got 3 helios 
Ghost and warthog =
All
Good old fashion Warthog
My favorite vehicle is probably the scout warthog. Friend Killing FTW
Oni Wasp forsure
Wasp,
Ghost Ultra and Banshe Ultra.!
Gauss warthog for sure
ONI Mantis and Hannibal Scorpion
Hannibal Wasp
Ultra Wraith and Banshee
The banshee ultra
Wasps are alot of fun 