Try them both out and see which you prefer.
Unfortunately asking these questions in the marker specific forums will tend to only get you a biased response, as the Nerve owners will favour the Nerve, and the Defiant 2 owners will favour the Defiant. The only way to get an unbiased opinion, and one that is truly relevant to yourself, is to use them both and make your own mind up.
This won't of course give you any information about long term reliability, but questions of that nature can be asked without placing one marker head to head with another, and can also be researched by reading the reviews.
It's just like a battle zone, you got a bottle and you're on your own.
Gotta be a Scotch or a Kamikaze, none of those other weapons will faze me.
Hundred, hundred, hundred bottles on the wall, you wonder if you can drink them all.
Got to go home by 1am, the bottle wins the battle again.
Husker Du - "First of the last calls"
Back when I was popular
Supporting a friend:
HustlePaintball.com for Spyder paintball guns, Dye Markers, WDP Angel 1 and of course the Hustle Hotties.