Well, bounty hunting hasn't been exactly fleshed out, but we can always read the signs...or the stars...or...the Auroras' explosions.
We know we got systems for stopping other ships, boarding them and transporting whatever prisoners we take and their pets. So we definitely know it ain't goin' to be a simple point and shoot activity, like in ED. But it can be.
Now, regarding what ship would be best...I guess it'll depend on what kind of bounty hunter you'll want to be.
I'm assuming for a solo bounty hunter, taking prisoners alive would be difficult and would present very high risks. I find it hard to believe you'd be able to run solo and fill up the human cargo hold of an Avenger or a Cutlass Blue in one run. So...I'd say the best ship for this would be a Super Hornet, as it allows you to kill more easily, and it also has that second seat, which was advertised as being capable of prisoner transport. Now...how I would convince a prisoner not to steal my ship if he gets in first, or not to run away while I do it...beats me at this point.
If you're thinkin' about takin' prisoners alive (assuming it pays better), I'd say you'll need to be hunting in a team, as none of the current ships possesses the ability to do everything. The Warlock doesn't have prisoner cells, the Stalker and Cutlass Blue don't have the EMP capabilities of the Warlock, and none of them have very good fighting abilities. I'm under the impression the Cutlass Blue will have heavier weaponry and will be able to mount more sophisticated systems (the EMP sort), but I'm guessing it'll also be lacking good speed and agility, so any target that you could take down in it, will also be able to escape you with ease. However, at this point in time, this one seems to be the most dedicated and potentially useful for bounty hunting.
As far as I'm concerned, I'm considering getting a Stalker, only for prisoner transport...or smuggling. I like my cargo quiet, and I'm under the impression that an Avenger would be a tad stealthier than a Cutlass, considering size and cryo pods. I was goin' to get a Blue, but then I realized that kinda' puts me on the...wrong side of the law.