I did OB for 6+ years and was a trainer there. I never thought lanes were that bad. Occasionally you had days where your ass got handed to you. But as long as you kept your lights out it was fine. And all the running keeps you in decent shape.
Plus OB, in my opinion, has the best specialty functions. Closing kept you busy, and busy means the shift goes by faster and you weren't stuck doing the same thing for the whole night. In our building, if you were good the OM basically left you in charge of the shipping wing.
Mezz has its pros and cons. People who were never mezz trained always complained that we had it easy. And then you get up there and realize what kind of hell on earth you walked into. Its the kind of place where either nothing is going on and you're bored out of your mind or everything is going wrong at once and you're barely keeping your head above water. And its a small team up there so if one or two people aren't carrying their weight it can ruin the whole night.