For terrain park riding I wouldn't be worried so much about the binding physically breaking on you, if you buy from any of the companies already mentioned the binding will hold up fine and if it doesn't that means it's probably defective and you'll be able to get it replaced.
Do some research on which binding is the safest, that's what you're ultimately paying for; I haven't ridden the axial or the fks but just from a quick google search the fks appears to give you a cleaner release especially under torsional stress. The axial, which is a race binding will likely respond differently to torsional stress to allow for high speed race turns on edge.