Yes, there is more variance in turbo MTTs because of the rate that blinds increase. The faster the blinds increase, the faster stacks decrease. When this happens, you lose plays like effective 3-betting, set mining, etc, and you're put into situations where you have to get your chips in the middle and hope for the best
Turbo MTTs are good if you multi-table them, have a decent understanding of MTTs and know how to make the right adjustments. The best way to reduce variance is to get more volume in. A good thing about turbos is that they finish a lot faster, so your $/hour is much higher than a normal MTT.
Now, if you're a new player or don't have the bankroll to or can't multi-table turbo MTTs, then you're better off sticking with normal MTTs. The lower blind speeds allow for more optimal plays and you can be more selective with hands and positions. The only downside is the can be very lengthy at times.
I guess the best option is to play whatever you're comfortable with and whatever you have better results in.