Series 5 vs series 7 apple watch July 8, 2019 16 32 64 128 Apple watch series 5 44mm vs series 7 45mm Apple watch series 5 vs apple watch series 7 mm specs Iwatch series 5 vs 7 Apple watch series 5 6 7 comparison Apple watch series 5 vs apple watch series 6 Apple watch series 5 vs 6 vs 7 vs 8 Apple watch se vs 5 series