Personally, I almost never "turn off" my surface; I use the button on the top edge, which puts it to "sleep" in standby mode, but does not actually power it off (unless you hold it down for several seconds as opposed to just pressing it quickly, if you hold it down for several seconds I think it does power off). I feel that is the best solution, and battery life does not seem compromised much by putting it in standby as opposed to turning it off. If I feel I will not use it for an extended period (which is rarely the case), or want to refresh it for some reason, I will shut it off or restart it by going to settings and using that power button. I like standby because the surface wakes almost instantly.
Hope this helps.