Mountain dew with good carbonation and right ratios out of the soda machine. That stuff is as good as coffee and energy drink without the crash.
vanilla coke is my all time fave, but a nice cold can of regular coke is good too. I also love a&w cream soda and root beer.
I don't care for root beer, my favorites are all your others except the magical Qdoba soda machines let me do raspberry Coke which is the dank diggity. on my second grow: 1000W Coco Sour Diesel SCROG http://forum.grasscity.com/index.php?/topic/1255714-1000W-Coco-Sour-Diesel-SCROG
I've never tried raspberry coke. Not even sure if any of the grocery stores around here carry it, but it sounds pretty good.