I always use Titebond III, end of story. It has a hold that I find scary. Everything I build, I test, and even on hard scrap like oak, the wood breaks before the glue bond.
Your cutting board looks beautiful. Great job.
I don't biscuit anything anymore. I have three methods of choice, depending on a) who will see it, b) function of the piece, and c) what it's made of. First, you have just brute force - clamp that thing together, as tight as you can, and use face clamps to draw it in. This works quite well with wood that isn't warped, and is preferable on some projects. I try to do this on my cutting boards, but I usually use method two. Second, you can try dowel rods. My father has a dowel jig, and it works so amazingly well… when you remember to tighten the screws. Again, this is preferable if someone will see/use both sides, but beware - I once planed through to my dowel hole because I forgot how deep I was. My wife still adores her cutting board, but it pisses me off that I messed it up. Either of these methods is just fine, just prepare for a bit of sanding regardless of your method.
Third is unfeasible for cutting boards, but I like my pocket hole screws a lot, and they work nice. Couple face clamps, couple bar clamps, TBIII, and you've got a fortress. See my desk project - the entire top was fabricated in this fashion.