I've built two pram's over the years (I have one pictured in my photo album not to be confused with my current flat bottom dinghy project). Mine were rugged and could carry all that you put in them. They rowed nice and true and were stable with a small outboard as well.
My suggestion would depend upon your use. If you want this to get from ship to shore at a floating mooring or a short tow - the pram is far better. It will carry more, offer solid footing, more protection from splash with higher gunwales, and will be less affected by wind. It would be too heavy to hoist up onto a vessel without a crane.
If you want something that you plan to carry aboard you would definitely want an inflatable. I will be using my rigid dinghy to get from ship to shore at the yacht club and for short/slow tows. For overnight cruises and such I use a 6' Mercury inflatable (Roll-Up 200). I can hoist it on the roof by myself or very easily with another set of hands. It is relatively light, stable with a small outboard, and of course will not scratch the roof. It is no fun to row this thing any distance in wind or current.
These are the trade offs.
Good luck with your decision.