The Space Marines are privvy to some of the most overpowered technology in any sci-fi setting, and even they're outdone by the DAoT.
I know this is off topic, but no. . . just no. Space Marines throw the equivalent of snow balls compared to the vast majority of Sci-Fi, let alone military Sci-Fi.
On topic, I'd imagine it would greatly depend on what kind of planet was encountered, what kind of local threats that planet were used to encountering and the status of it's defensive forces.
There are just far too many imponderables for a clear winner.