I'm playing an eladrin wizard right now (19 int, 16 dex). I don't know if it compares to the other two masteries so far, but so far I'm liking my wand.
Once per encounter I get a +3 to my attack roll, pretty nice. I use it mainly for my ray of enfeeblement and my sleep spell (assuming I'm getting the big guy in the spell). I do a mix of rays and area effects, and I get the added bonus of a better init.
The other thing to consider is the wand itself. I think wands are one of the best magic items because you can put powers in them! They are the only magic item where you can basically pick the powers you want and slap them into a wand.