Bounty hunters have to lock pick cars and get charged for it, where as cops can pull people out of a car without needing anything. Bounty hunters should be able to learn a honor talent where they can pull people out of locked cars.
Cops can initiate with a siren in a car, where bounty hunters have to text the person and risk crashing. Again, bh's should be able to buy a siren from the skip tracer market (just like a tracker). Or have a honor talent that allows bh's to have a siren already attached to their car when they pull their cars out.
Cops have a variety of guns, (spars, mx's mxms, mp5's, and mk-1's) I think that with enough honor, they can buy better guns.
Bounty hunter's only have zip ties, and cops have handcuffs. Bounty hunters should be able to buy handcuffs (obviously for a higher price)
Flash bangs, bounty hunters should be able to buy flash bangs but for an expensive price, 5 thousand dollars a piece.
Spike strips, bounty hunters should be able to buy spike strips from skip tracer (again, for a much higher price)
With enough honor points, bounty hunter's should be able to drop bounties for a shorter time limit.
Feel free to post your opinions and more ideas for bounty hunters.