gt5 pro vs watch 4 pro

is there health tracking diffrence between those two other than the new sensor of the gt5?(like gt5 pro has stiffness detection ecg and some others does the watch 4 pro has anything more in health tracking assuming we enable all features by changing location.) Also do you know if the watch 4 pro has 32gb cause the storage of the gt5 pro sucks with maps you cant get a lot of songs