At risk of being slightly serious on this fun thread, it kind of depends whether your preference is to sail
(a) sitting in the middle behind the wheel (with view largely blocked by mast, and very limited view of genoa telltales, if at all) - in which case one smallish wheel or tiller is just fine and dandy
(b) sitting to the side, to get a better view and "feel" of the sailing, albeit also windier and depending on boat perhaps wetter- in which case a long tiller extension, large single wheel or twin wheels are needed.
Personally I prefer (b) and would not buy a boat with a narrow cockpit and a small central wheel - even some otherwise nice Malo's etc. it is a deal breaker unless possible to retrofit.
On moderate sized boats a large single wheel is good for sailing, but does get in the way for Mediterranean style berthing and swimming - and impossible for super wide boats - where the twin wheel loses some feel but otherwise a good compromise.
Sorry, I forgot to put an irony smiley on my post!
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