I'm going to agree with what a few of the others have said. When I first cooked ribs I thought I wanted fall off the bone. That's what I had gotten from my oven ribs (when I lived in an apartment and didn't have anywhere to use a smoker or grill outdoors), and I thought I loved it.
The very first time I smoked ribs, I found out that when ribs truly fall off the bone, they're just losing that meaty "bite" that I find very satisfying. My wife still wants them to fall apart, but that's why she likes baby backs and I like spares I guess.
I've mostly used 3-2-1 myself, and it's been good for me, although like it's been said, you may need to try and tweak a few times to get it right. I went back and forth between falling apart and a little too tough the first few times before I dialed it in. Since I use a sweeter sauce, I always leave an extra 5-10 minutes at the end to sauce them and put them over a hotter fire, to caramelize the sauce a bit--but this can burn very quickly if you're not careful.