Chiming in on Maya Air/Tropic to San Pedro.
We used Maya Air. Leaving, we thought we might catch an earlier flight so went to the airfield early, no such luck.
I did notice that Tropic seemed to be outflying Maya by at least 3 to 1 in departures. Don't know if that is an accurate reflection or not, but the day we left there were definitely more Tropic flights than Maya. I suppose that could work in your favor either way.