If you are talking about a regular inflatable dinghy and not a RIB, it's your pick. I've used both on 9 1/2 to 10 ft. inflatables.
The high-pressure inflatable floor will cost you more than plywood.
With reduced weight, you may find the inflatable floor boat may handle chop better.
A lighter boat is easier to lug out of the water. And it's faster on the water than plywood. This may matter to you if you are involved in dinghy drags.
The plywood floors are much easier for standing up or stepping around on the boat.
A plywood floor (especially with metal floor strakes) is more rigid than the inflatable floor and may get up on plane quicker.
On a hot sunny day, dark-stained plywood floors can get very hot on bare feet. Some plywood floors come with light-colored antiskid covering materials. Or, you can wear something on your feet.
If you can brush on some varnish, you can keep a bare plywood floor looking like new for just about forever. An inflatable floor and white tennis shoes can look about the same after a couple of seasons of use.
A plywood floor will never get an air leak. I've known a couple of boaters who had air leaks with high-pressure floors.