Do I really need AVG?

Recently AVG has been extremely annoying. Games that it didn't used to flag are being flagged; older games (Star Wars: Starfighter) are crashing because of AVG (Game starts, loads some, AVG brings it down claiming it's a virus, same old same old). Perhaps a recent battle with AVG (my father's laptop had AVG firewall enabled, which was creating all sorts of problems with Windows Firewall, and also prevented him from accessing the network HDD) has soured my opinion of it, but I'm really thinking: Do I honestly need it? Longer boot times, less resources for other things (even if it's a marginal amount, that's still ~50MB of RAM or ~15% CPU time I could be using for video editing, gaming, or rendering), and those really annoying false-positives (it even flagged Crimson drivers when I installed them).
I'm much more informed on what to do and what not to do in the net world. I don't go to any shady sites, and I scan every screen while I'm going through installing freeware (or updating Java for that matter. No, I don't want Yahoo as my homepage XD).

Furthermore, my friend has Malwarebytes premium, and says it uses far less resources than AVG (he backed it up with a RAM usage of ~30KB, which is far less than AVG's 50MB), and personally, I like Malwarebyte's scanning (I've only ever had the free version) over AVG's; seems more efficient.

There's also Windows Defender, which recently reminded me it existed.

So, TL;DR
Is there any real reason to keep AVG, assuming I'm mindful of what I'm doing on the web? I'm more than willing to buy Malwarebytes premium in it's place.