Both the SST8's and Tour Ultras have pros and cons. The fact is the two different shoes have a very different feel. It will be individual for everyone. The SST8's provide a more stable footprint. The Tour Ultras wear like slippers. There is no right or wrong with either. It's comes down to what feels better on your feet.
There is no substitute to understanding the needs of your feet (arches, pressure points, etc), trying both on, and then making a decision on which shoe best fits your game. There is no other logical way to decide.