Can I say neither? SAO seems kinda overrated and Accel World's protagonist sucks. Not because he's fat or anything, but he whines so incessantly that it's hard to not hate him.
If I had to pick, it'd be SAO because that's pretty alright.
You're suck on an island, and you're allowed to bring 3 things:
1. A recreational drug that you've never used before
2. A item whose name starts with the first letter of your first name
3. Someone whom you've never met before in real life
What do you bring?