The M 37 is a slick piece of work-smoothest pump I've ever shot.
Only drawback, for me, is the crossbolt safety. I'm used to the top tang safety of a BPS or Mossberg, and can always find it quickly on a bird flush.
On ducks or turkeys, there's generally more advance warning and, for me, adequate time for the crossbolt-so that's what my 37 is used for / restricted to.
Many others do just fine with crossbolts-just depends what you're used to.
Pick the one that fits and suits you best, but remember that if you ever have to use it in a real emergency, the safety has to be as natural as possible for YOU to operate, half asleep, in the dark, under pressure, scared or whatever.
Then practice, practice, practice til you can handle the gun effectively under all conditions.