I listened to all of those speakers recently so can give you my take on them. Please remember that's how they appear to me, I'll try to stay away from subjective terms (and fail miserably right away).
The Dalis really want to have a go at it, like an excited dog that knows it's gonna have a bisquit or a walk in the park. As such I feel you need an amp that's able to kinda reign them in. Pair them with a NAD for instance that's forthcomming when it comes to bass, the Dali sounds like it should be tripping to lay it all out there, while in fact it isn't. They do a good job but it's confusing to me. It's not unpleasant; quite exciting really but to my ears, that like a bit more control and clearness, it sounds a bit messy and fatigueing.
The Wharfedales are warm speakers with excellent control over the bass and more control overall than the Dalis, which makes them sound like they have a bigger reach when it comes to tones.
Monitor audio have more control still over the mid and high tones than Wharfedale, which makes them sound more clear than the other two and for me made for the most easy listen (others might find it dull though). They are very open and sound like they present the music without effort. The music feels very unconstrained and precise. This does make the music a little less exciting in some ways, sometimes you want to put a bit of preasure/focus on the bass or screaming guitars or whatnot. Monitor Audio doesn't do that, they leave it up to the music to deliver the excitement, they are very honest and that's something that must tickle you. This does mean that a bad press or bad mastering, is more apparent. A flat album will sound flat listening through Monitor Audio speakers, while Wharfedale will add some warmth and the Dalis will add some tempo. Of course the amp has a say in this as well, but only up to a point.'
A thing to consider as well is your room. My own room for instance is quite small and filled with bookshelves and paintings. As such there isn't a lot of reflection and a system will sound much warmer and smoother in my room than it will in most listening rooms. As such I chose the Monitor Audios (BX2). I don't need the excitement of the Dalis and the extra control and more open sound outways the warmth of the Wharfedales, because my room allready provides that.
I hope this helped, but only you can decide what is pleasant for you. I did find out that the reviews here on WhatHiFi are spot on, and ones you know what WhatHiFi for "exciting", "warm" or "dull" speakers mean to you, these reviews can point you in the right direction. I know that to me, "exciting" to WhatHiFi means "messy" to me; "too smooth" means "warm" to me; "dull" means "non-fatigueing" and "overanalytical" means "open" etc. A "dull" speaker in WhatHiFi-talk seems to be enough excitement for me.
To you it might mean something different still, so when I say I would never connect Dalis to a NAD, that might be just the ticket for you. You'll know it when you hear it. When I found the speakers that were right for me all doubt was gone.