center-mount snorkels finis swimmer's vs. frestyle

I use a snorkel in my longer pool workouts. I use it for drills & w/u and frankly when I'm too bored! I want to use it to simulate what i can of altitude trianing (not getting enough air). So that said, my old snorkel (which I first bought @ 8 years ago to use with a mono fin) is tired out (all the plastic is cracking and making the air taste bad). I was going to just repalce it with the swimmer's snorkel which about the same thing but i noticed the free styler which is cheaper and might work better (I have trouble with the old one swinging around off its little pivot which is part of the aging I suppose). So any advice from anyone, reviews? Likes/dislikes?