The seats are much more comfortable on the later cars not just due to the shape and padding but more so the incline of the seats. You sit very upright in the '70 seats. I do favor the look of the one year only seats.
I had a '72 RS Driver Z28 Look Camaro 307 TH350 and A/C which I put about 10,000 miles on in two summers. Very comfortable car.
Here are a few familiar looking cars including a real RS/SS L78
http://greene-shipman.org/ChevyCamaro.html The copper one is the '72 I referenced .Tt sold for upper teens three/ 4 years ago. The silver RS sold at auction 4 or 5 years ago for mid teens. The L78 RS/SS sold a couple of years ago to a very wise individual, price?