Davis and White are merely skaters whose every step and turn is done at the request of the choreographer's without any emotion or feeling behind it. They're good at grabbing every single point there is to grab but boring to watch. They should be grateful for the COP system.
V/M take choreography and make it more or less their own. I think the times they skate so well is because they enjoy doing it. I like Zoueva's quote- "The majority of ice dancers today imitate dance, but Virtue/Moir actually dance."
I think that's a bit too harsh! I'm a total V/M uber but I love D/W as well. Both teams are wonderful; just very different in style imo. We're very lucky to have them!
D/W have crazy speed and attack. Their twizzles are just

. They're very "rah-rah", dramatic, passionate and have a very "raw" quality about them. I will disagree that they're not musical; they just have a more Broadwayish style, like mathman said. Like V/M, I get the impression that they too skate from the heart. Just that while V/M are more introspective, they tend to project outwards. Not a bad thing, just different.
Watching V/M is like what Rod Black said; it's like getting a sneak little peek into something very very special. They seem to be in their own world, dancing like no one's watching. Their chemistry and musicality is utterly amazing (Valse Triste!!

). Very balletic (their posture, lines, toe point and port de bras are fabulous), lyrical skaters. Of the current lot of dancers, I'd say they most closely fit the ideal ballroom dance couple. In comparison to D/W, they're more refined and graceful imo; their lift exits are so gentle and flowing! While they are impressive technicians and their lifts are insane, what I love the most is that they always dance with each other. No faux, OTT draaaama (often with fugly costumes urgh), just dancing.
D/W still have a slight tendency to become frentic at times (I'm always nervous watching them do twizzles, especially Charlie!). V/M are like G/G and Shizuka (when she's on) in the sense that everything looks so easy and effortless. Their programmes look deceptively simple and they are incapable of being inelegant, especially Tessa. Imo, D/W still have some way to go in terms of the little details like toe point, which V/M excel at.
While D/W's height differential isn't glaring a la Shibs, I think a reason why V/M look so "nice" is because of their unison and how close they skate, aside from the fact that they're both so gorgeous. Their body and leg lines are just fantastic. Also, being closer in terms of height isn't necessarily a good thing - lifts are more challenging!
Oh, and I appreciate the fact that by and large, their attire is tasteful and aesthetically appealing (K/N and Dom/Shabs OTOH ... :disapp

. Thank heavens these two are putting the class back in ice dance!
IA that they haven't reached their full potential yet, especially artistically. I'm praying to the skate gods that V/M will continue for a few more seasons and have voidtastic programmes like PF (Has D/W confirmed that they plan to stay on til Sochi?). Both teams are incredibly mature for their age though, to be fair.
Go Marlie and Voir!!
Off-topic: Does anyone think them (and Belgosto) should go guest star on SYTYCD some day? I'd love to see them dancing on the floor!