I think that guns are pretty much a personal choice, ie, say you've got an angel sponsorship, but you started out on cockers makes you want to have a cocker with the firepower - eblade.
I've never fired a matrix so I can't say what its like, I only know they're superfast, same goes for timmys. But I would chose an e-cocker or perhaps an impulse because thats what I feel comfortable with. I dont particularly care how fast they fire aslong as it doesn't limit my ability to shoot my form of fast.