If you haven't already, you should take your boots in and see how your boots fit in each binding. Test out the toe strap on the unions. Also, the 2012 cartel only comes in re:flex, so that might be something you would like to try. They are both mid-flex do it all bindings. If I were you I would prob. buy the cartels cause I haven't tried re:flex bindings yet. But its hard to go wrong here IMO, my forces have been great bindings, as were my 09 cartels.
You won't regret either. I've been curious about autocant though, seems cool. I got to use some 390 bosses that were canted, and while I thought I didn't notice any difference, my knees felt a lot better at the end of the day, I wish union would make some canted bedz because I looooove my forces.