I looked at pros and cons last year when I got my Rib, decided Dry Stack was best possible compromise, less of a pain than towing and I have found I do use my boat alot because it's easy to just turn up at the Marina. I use it most weekends in the summer and every three weekends in the winter. Some winter days can be nicer than summer days.
However I do still have a massive trailer filling up my drive way allthough I have plans to clear space in my garden to park it or even considering maybe selling the trailer.
Mooring or dry stack will be costly, I think you have to consider how often you will use it or want to use it, there is no getting away from the fact Marina's are convienient, just turn up and go, also consider how nice it is to just go for a run in it some evenings as well.
It does get grubby in a dry stack but if you have a good cover it's not that bad.