Good list of + & -s.
If you put aside the eventual storage issue, the big question you maybe haven't explained is how do you plan to use the boat?
Hard bottoms are usually bigger.
Yeah-- the central question should first be: "How will I use it?" and then proceed from there. If you're going to frequently anchor out in remote places and want to "zip around" the area(s), perhaps as much as three or more miles from the motherboat, carrying your wife and picnic supplies, etc., in modest seas or less, then you need a rib or some other fiberglass bottom with a 10+ hp outboard which most likely will require the installation of davits to launch and recover easily. Just remember, however, that if going "blue water" long or far, carrying a heavy dink on davits might prove a liability under sail in big conditions.
If you need a dink just to go from the boat to a dinghy dock in semi-protected waters to buy a drink ashore or to fetch groceries, or to beach land, on twice-annual trips somewhere for a couple of weeks or less each, or on frequent weekenders, then I would get a 8-9 floot inflatable that you can stow aboard and the smallest 4-stroke outboard available for relatively easy lifiting. A heavy dink on the beach is very difficult to heft up above the high tide line so you can go exploring.
The last thing I would do now [although it has been successful for many cruisers] is buy a dinghy that I had to tow for long distances across open seas or channels. If you cannot bring it aboard and secure it while away from shore then get used to the idea that someday it will likely go its own direction!!