I used to use negev since I find for most maps you don't need to run and gun but hold the line insetad. As a result, the bullshit accuracy on continuous fire and high damage (i.e. high k.b.) and high ammo of negev makes it a perfect choice for gunning when not running. Also if you compare k.b. / damage per second including reloads, negev provides a better option than bizon in mid range and long range. Under no circumstance is ak/m4 good for defending, but ak47 is the best choice to finish off 100 hp zombies at the end of ff_alien_mountain_escape (or whatever it is called). Nowadays I use a p90/usp-s since i have a death by kitty / neo noir for them LUL.