Zefan said:
LINK
Explaining how the particles work. It's more to do with what sort of a distance they can reach. As you can see B theoreticallyl pushes through objects less than G, but I think if youre within about 3 metres of the router the B will be faster. If you're at any sort of distance (3 Metres +) then I'd always reccomend a G to penetrate walls etc (I have a friend with B and he gets awful signal through two floors and about 4 metres.)
They aren't beta particles or gamma rays, they're microwaves (with the same frequency, wavelength, energy et al)...
Gamma rays aren't particles (in the same sense as beta particles) either...
As burbleflop said, they're both faster than your internet connection, so if that's all your using it for, you're not going to see any gain.