I have Bosses on the Evo. Awesome combo. I'm just not into Union. Really disliked the 2012 Force and Contact Pro.
I also have 2011 Burton Restricted Hail boots in 9.5. It has shrinkage tech and I can fit them into my L/XL Boss bindings. Takes some adjustments so read up on the manual first.
My vote goes to
390 Boss >>>>>>>>> Union Force