Size isn't the reason I went with the larger phone last time I upgraded - it was the longer active (rather than standby) battery life. I can be a fair distance from any source of power for a goodly time and not worry about it shutting down for that reason. Even smaller devices (of those easily available at the time) showed less endurance in independent tests, due to having the smaller battery in their smaller form and/or less advanced chipsets, the exception being one with a lower resolution screen but that was a compromise point too.