Mission drives the gear train. Three things re EOtechs.
1) If you are doing pre planned, short term missions where you can turn the optic on at the start of the mission and you can simply proactively change batteries every mission/day/ week etc then the batter life isn’t an issue.
2) The bigger window and the circle dot reticle are fast and the bigger window allows better light transmission if your laser goes down or would give away your position and you have to shoot with RDS and NODs.
3) IME the sideways battery Eotechs have longer battery life and are more reliable than the earlier dual battery models.