Watch series 7 vs 8 comparison July 8, 2019 16 32 64 128 Apple watch series 7 vs 8 comparison Apple watch series 7 vs 8 size comparison Apple watch series 7 vs 8 vs 9 comparison Apple watch series 6 vs 7 vs 8 comparison Difference between apple watch 7 and 8 Iwatch 7 vs 8