uvLayout, anything else compared by it is just poor in performance, features and workflow including all specific UV tools that are on the market. But if you are just after relaxing its not worth the hefty price,- maybe then instead go with Roadkill, existing max/maya relaxing tools or like mentioned above the Crazy…
I use 3dsmax too, I've tried out a few tools but in the end I pretty much stick to max. HeadusUV (not free, wonky interface has some cool tools but really not worth it IMHO) http://www.headus.com/au/uvlayout/ Crazy Butchers LSCM Unwrap (Great script) http://www.luxinia.de/index.php/ArtTools/3dsmax