That topic has been flogged to death here, so you might be asked to do a search on the site
IMnsHO there's a lot to be said for a tiller in terms of control, and don't let anybody tell you that it is a requirement for anything below fifty feet.
Some newer wheel steerings are really nice though, while many older stinks - especially hydraulic ones.
Boats with big behinds (wide transoms) might benefit from double wheels, making sure the helmsman can see fwd when heeled over.
I've owned boats with tiller and wheel, and sailed many others, and it always depends