I think what course you do depends on what you are most afraid of. I went to AFF recently with lots of tunnel time (talking 25+ hours). My transition to the sky went very smoothly as such. Freefall was easy, I knew how to do maneuvers and how to relax in the environment already, and I feel like it helped give me more attention to focus on the things that actually matter like piloting a parachute, learning altitude awareness, packing, EP's, all those necessary things you can't live without that you really can't learn anywhere but the DZ. If you're scared about not really learning how to fly your body, then go to a tunnel and learn there. If you're worried about the rest of skydiving, maybe a bit of extra coaching could be worth the extra cost. This is a sport to be taken seriously, but the information has logic and common sense behind it, and as long as you're not an idiot you'll be manage to survive and have the time of your life no matter what kind of course you do.