Simply put, it's not a matter of tubes or SS. It's a matter of preference. We've covered (in many threads) the recommended amps for Vandersteen speakers. There are some of each and you should listen to the ones that you think best fit your tastes.
The short and incomplete list, in order of preference, is (from personal experience):
BEL 1001 Mk V (SS)
Quicksilver V4 (tube)
Theta Dreadnought and up (SS)
ARC Tube amps 50-100wpc
There are many more, and just because I don't list them here isn't meant as a slight. What it ends up being is a matter of taste. What you'll find is that the amps with the least signature sound of their own will probably be your favorite. For me that means BEL amps. If I were to choose a tube amp I'd consider the Quicksilver V4s or newer ARC tube amps. YMMV!
Last, IMHO the heart of the system is the amp. You've got one of the best speakers at any price. Now it's time to put a great amp in front of it.
(Hopping off my soap box...)
Hope that helps! Enjoy the auditions too. That's one of the most fun parts of this hobby. ;-)