Definitely stay at Tavarua if the wife is coming. The pool is amazing and if wind is the right direction you can kite right in front of it in the lagoon and show off. Watch out for the coral though at low tide.
And when you go over to Namotu make sure you ask nicely if you can kite there out of courtesy (they'll always say yes) and buy lunch and beers there to thank them for the hospitality.
They are very cool friendly people on both islands.