Tropic Ferry has two boats, that I'm aware of. One smaller maybe 24-26' and another larger boat in the 30's similar to the regular Ferry.
The local issues referred to have been going on for years and have died down to almost nothing as far as I know. Yes, they are more expensive, however it includes picking you up at BZE and bring you to the dock nearest where you are staying. Therefore you do not need to take a taxi to the Ferry Dock in Belize city. (I think it is more like a 30 minute drive but I haven't done it in a little while.) You also don't have to take a taxi from the ferry dock in San Pedro to your place, especially if you are north of the bridge.
Probably I've used them on 4 or 5 round trips. I did take tropic ferry last Saturday. There was an issue with help not showing up but......welcome to Belize and the New Year's Holiday celebrations. Also, it appears the local management has changed and either needs more experience or a change.
I will take them again on my next trip. Hopefully this helps you.
Somewhere on a beach in Belize