Amazfit gtr 3 pro vs gtr 4 new July 8, 2019 16 32 64 128 Amazfit gtr 3 pro vs amazfit gtr 3 Amazfit gtr 4 vs gts 3 Amazfit gtr 2 vs gtr 3 vs gtr 3 pro Amazfit gtr 4 vs gtr Xiaomi amazfit gtr 4 vs gtr 3 pro