I have a pair of z12ti's and px14s....
I put my px14s on my park skis and my z12ti's on my pow skis. Never had a problem with either binding. before I had my px14s, i had sth12's on my park skis and still never had a problem.
I would vote for the axials on your park skis because they have a 10 way release pattern, and the sth's have a 7 way release.