That brings back memories. The first time I ever heard of Digital Unix was in college looking at netcraft.com's web server ranking, where it showed that www.amazon.com was running on OSF/1. I figured if Amazon was using it, it must be worth looking into. Found an Alphastation in an IT storage room and had some fun playing around with it. Good memories.
Yes, Alpha was incredible for the time. Sparc was a dog in comparison. Software wise, Solaris felt more standard though. I remember having to tweak open source stuff to compile on Digital Unix. Solaris almost always just worked.