I'll chime in here... This has been brought up many times so search bar can be your friend. But never the less; go to a shop that does boot fitting. Try on a few. They're each made a little differently and it's all going to depend on how your foot fits in the boot. Both boots you mentioned are great boots, but its whichever will fit your foot better.
If for some reason you've already done this, and just failed to mention it. The SPKS are quite nice and I liked them a lot after seeing them in person.