ive tried both, i dont think either or will be much difference. during my first week, i tried to drain the crap out of it during the day and by the end of the day, i just leave it charging over night. the next day went really well. dont forget to restart it once in a while during the first week or so. im not sure what this does exactly, maybe its my own OCD.
i can get a little more than 24 hours off a charge, but i havent really "tested" it cuz i charge it when i go to bed. the shortest ive had it was about 14 hours or so because i was streaming pandora all day at work.
anything that involves a lot of screen time and processing power, like games and browsing, will usually take a toll on your battery of course. tahts what i have noticed for the past 2 months that ive owned this phone.