They're both excellent boots. Unfortunately, trying on a pair of new tech 8's won't do them justice. It takes a ride or two to break them in, and then they do feel great, but I'm sure sidis do too. I have two pairs of tech 8's, and other than some broken buckle bases on the old pair (all of which were taken care of by the mfr (excllent customer support) and soft soles on my new tech 8's, the boots are great and last a long time. Finally wore out the soles on my old tech 8's after five years of 35+ rides per year and had sidi soles put on. I'm good for another ten years!