I'm a bit surprised that this thread hasn't been moved to another forum. This is strictly for questions about the website itself.
To the question. I would prefer CNG over propane, if not for the difficulty to refill in the US. But it isn't impossible. CNG, being lighter than air, is more likely to exit the boat in the event of a leak. Propane, being heavier than air, will fill your bilge and potentially be ignitable. I say potentially, because propane must be in a narrow mix of oxygen and propane to ignite. Too much or too little oxygen and it will not light. Still, its more dangerous than CNG.
For a weekend warrior, I would keep it, if I could find somewhere within a reasonable distance to refill. While we have propane, we live aboard for nearly 100 days per year and barely go through 20 lbs of propane in a year. Not a big chore to refill. We don't use it every day, of course. Ironically, I also have to drive about 25 mins to refill my propane, because nearly all places have now gone to the tank swap process. I want to keep my new tanks.
Here is a website I found to look up CNG refill stations near you. Looks like there is one in Tampa.
CNG or Compressed Natural Gas Fuel Stations Locations - Locate CNG or Compressed Natural Gas Fuel Stations Near You with Mapmuse's CNG or Compressed Natural Gas Fuel Stations Locator