I think Mr Sugiyama is enjoying your Trek!

Stainless steel is a weaker steel alloy than CrMo steel. But CrMo lacks corrosion resistance of SS.
I've not come across DT CrMo spokes. I wonder if these are mainly use for velodrome racing.
DT is a very popular brand that I've used for almost 30 years for all the wheels I've built. Never had a spoke failure so far. But they did change their spoke head configuration recently. So, YMMV.