Well, it seems like everyone has their own views for ganon's out of shield options. +1 for discussion spark, @
YvngFlameHoe
As ACE said, bair oos is amazing vs falcon because it beats everything. All aerials, grab attempts, everything. Falco, I'm not too sure about, but I'm a bit shaky vs. falco, so whatever. Just be careful with the lasers. I like it vs fox too when they try to cross you up with nairs and such.
I can't stress how good up air oos is. Be creative with it, but the disjoint is so good for scooping up your opponents. Falcon doing that annoying thing where he keeps pressuring your shield with repeated nairs (out of shield grab range)? Up air. Marth doing THE EXACT SAME THING? Up air. Easy. At low percents, you're all but guaranteed a second up air too- sometimes even a fair.
It can be used situationally vs. fox as well. Best when he full hops (obviously), but at certain spacings, you can trade or flat out beat fox's SH nair.
As for doing it quickly, I don't see why not just Y/X + C-stick. But do whatever's comfortable. People think I'm crazy for doing RLD without using the C-stick.
Wavedash oos is absolutely underused. DO NOT discount this one. It completely wrecks marth. Fsmash on shield is not safe- wavedash in and grab that ****. The same goes for fox's upsmash, though the timing is a little tighter. Again, be creative. Experiment with this one as this tech IMO has been pretty much untouched with dorf.