IMO Delta Green is a better crunch comparison and I agree STA is a bit less. The big thing in comparing STA to Delta Green, or Call of Cthulhu for that matter, is that PCs don't have to contend with Sanity so there isn't sanity rules to learn. Which are crunchy in both DG and CoC; albeit IMO it's sweet crunch like peanut brittle. STA players do on the other hand have to learn the Starship rules. As I said before though, and dependent upon missions, they don't have to learn starship combat until they've played for a while.