Honestly, I don't think you will. Because I have both, and neither is faster than the other, when watching download speeds.
I believe that in order to get 300Mbps speeds, you really need to be paying for some seriously fast internet. I had one of those slide in notebook cards, a Netgear, it's max was 54Mbps, & I never maxed that out. Yet I could download a 700MB Linux OS install disc in less than 10 minutes, and I now have a straight connection, & it's no faster.
Also, the 300Mbps are of the "N" band, which can only match up with a "N" wireless router (as far as speeds goes). Yes, it'll connect to a "G" router, but "G" doesn't produce these speeds.
Best of Luck,
Cat