I've played both and I love both for different reasons. I've done AKC Rally and Traditional Obedience, CDSP traditional obedience, and APDT rally.
A lot if what you take into it. AKC Rally is easy and the judging is too-frequently lazy and a lot of the competitors are lazy and kind of pathetic. (Apparently they just released new rules today, some of which are addressing this, though I haven't read them yet, just heard about them). AKC Rally has, I think, turned into a bit of a joke. An easy "gimme" title. Not for everyone- there are people out there putting in beautiful performances with their dogs- but for too many people.
I personally *don't* think APDT rally is easy, at least in the upper level. You've got a drop on recall, you've got a retrieve, you've got a pseudo-directed jumping exercise and a pseudo-signals exercise. It's not the utility ring, no, but it's not "easy". Yes you can talk to your dog, but you do get docked for double commands (wish they'd do that in AKC). I dunno, Luce and I had a ton of fun with it. She liked it way more than Novice obedience, but, well, Novice obedience is boring as heck
You get out of it what you put into it. I do expect energetic, correct, attentive heeling, straight sits, straight fronts, the whole nine yards. And yeah, it does kind of annoy me when slow, painful performances score nearly as well as my dogs' clean, much prettier performances, but I try to not get hung up on that. I know that my dogs are going in there and doing a bang-up job, and we have a lot of fun playing the game, so that's what I try to focus on
ETA: I didn't have any trouble transitioning to the "no talking" of the AKC Novice ring. I do talk quit a bit during rally courses, but it's primarily to give information to my dogs, not to cheerlead. You need a whole lot less information when you're doing a novice heeling pattern. Luce doesn't care about cheerleading, and Steve gets wound if I cheer him on so less is always better with him.