I don't have that particular Steinhart, but I do have a Nav-B Chrono, which is essentially the same case (although it may be a bit deeper with the 7750 movement in it), and I also have a couple of C8's.
The big difference is in the size of the case. On paper, they are similar, but in real life, they are quite different...
Quality-wise, I'd say they are on a par, although the CW 5 year movement warranty is a bonus.
Movement-wise, there is nothing to choose between them.
After that, it comes down to the design, which is a matter of personal taste...