The one positive I can see with a wheel is that guests on your boat who are rank newbies can take the helm and make the boat turn the way they want it to. I have found that some people are confused by a tiller.
The other positive about a wheel compared to a tiller is that the tiller sweeps the cockpit area, so on occasion I've come close to bonking a passenger with the end of the tiller.
But by the same token, a tiller swings up out of the way and leaves a wide open cockpit. A wheel can take up a lot of space and be awkwardly in the way. For example:
To me, that wheel looks really badly placed.