I saw these two bikes side by side at a dealership in 1979 when I was shopping for a new bike.
The styling cues are remarkably similar.
I paid 1500$ for the SR tax, license and T-shirt. The Triumph was twice the price. I didn't keep the SR very long. It was just too slow for me.
Who knows what might have happened if I coughed up the extra dough for the D model? I might still have it....