From left to right. 2004 Crossfire LP(450 OP) 45/45, 2011 Ninja SMP(550 OP) 68/45, 2011 Guerrilla Air Myth 2 (650 OP?) 68/45.
I much prefer the length of the crossfire (as seen by it's long service life for me). The Ninja tank is very close in OAL, it's fractions of an inch shorter than the crossy. The GA has a significantly smaller OAL, and is only about 1 oz heaver than the the crossy 45/45.
prefer the weight of the GA, and the OAL of the Ninja. That said, I've found it more inconvenient to gunfight & run & gun with the short length of the GA, so the Ninja will be my tank of choice.
If you already have spent $krilla on a new tank, and just want it to be a little bit longer, I suggest looking at the CP reg extender. They are $14 @ pb gateway.