Trailoring a boat or Leaving it at a marina...? Which is recommended?

It's much more convenient to leave it in the water at a marina during the summer months because anytime you want to use it, you just untie the mooring lines, jump in and go. Of course, you're restricted to one body of water (lake, river, etc) and you have to pay rent for the boat slip, but it's your choice if the cost is equal to the convenience.