I have two sets of loudspeakers, Vandy 5A and Von Schweikert Unifield Mk3. Both pretty great. The Vandy's are my preference of these 2, mainly for the bottom end. You will be happy with either of your choices, I am confidant. I would take the 5.
Choice of Vandersteen models
Assume the price for either will be the same. Quatro Wood(not the CT), or the 5 (not the 5a or CT). Both in excellent condition. Don't discuss alternative speakers, other than these two. Which will sound better, which will hold value better. I have Modwright OPPO 105, and NAD 375BEE amp, 150 Watts Per 2 channel.