I speak only from my limited experience, i have only used the extracta wand and the scrubba
And the scrubba is miles and miles and miles in front.
Steve and Mike have been at it longer than me, so im sure they have both had a few toys and found what suits them best.
But between the two the scrubba comes up trumps in my opinion.
It dosent ruck up carpet.
It is heavy and cumbersom, and im the first one to admit it but its worth it for the results it achieves.
This is its only negative point, and if you do a search on it this is the 1point you will keep hearing, but overall i find it easier to use than the wand, because if your a stickler for detail like me. Half the time when using the wand you wont be happy with the results and so keep going over bits.
How can somthing with a brush agitating as you extract, and a weighted head to ensure even suction not be better than that crap wand

I tried using my wand today as i was on a really awkward job "comunal area in flats" but soon went back to the scrubba
My advice, dont spend over a £1000 on one incase it dont suit you, but give it a try, pick up a used one for a couple hundred quid and if you dont like it sell it back on here for the same money.