Well, DH is way over a teen and has enjoyed his plain and interactive wands.
The wand-chooses-wizard stuff, well, as far as I know mainly happens in the show, and that's generally one person per show. I'm not sure what they do if you want to have that experience without the show. But you could ask them what wands for what birth months (that's pretty much the shorthand). Or you can have character wands.
I personally just don't get it. You stand in line watching 5 people in front of you do the exact same thing as each other, and then you do it, too, and then 5 more people do it. Even DH and DS, who *like* it, just started pointing the interactive wand tip at the box with the sensor rather than doing the motion. The motion is persnickety and it's a challenge (sometimes) to find the sensor, so they just started doing that. I sit around looking at all the traffic jams the whole thing causes. (I'm not a fan of the similar thing at disney, either)
Anyway, budget for interactives for each, and let them choose.