The problem with all three is the power supply. We just don't have the power generation capability to make man-portable EM acceleration guns or lasers.
Although with lasers the problem is even worse, since the total lack of penetrative capability means you need a ridiculous wattage to make an effective weapon. Otherwise you just have something that gives injury ranging from blindness and severe sunburn to third-degree surface burns. Will it kill someone? Sure, but bullets are way simpler and arguably more effective.
EDIT: I just had an interesting analogy pop into my head.
A laser beam is the ultimate boutique exotic ammo- an infinitisimally light projectile loaded to literally light speed. Heh.
Expect new releases from DRT and Extreme Shock shortly.