I use regular coke when I'm dropping fast because I find it works faster for me than juice (I've never been much of a juice person anyway). I've used the glucose gel tubes a couple of times and they work well too except I found it hard to get all the gel out of the tube so for dosing it's hard to tell if you're getting the full amount.
The only flavor I've seen in the gel though is orange and I've never liked orange since I was a kid and had to chew orange flavored baby aspirin...yuck.
I use Smith Brothers Cherry cough drops. Their main ingredient is glucose syrup. They are cheap, individually wrapped, and don't taste too bad.
I've used skittles (mostly). Occasionally sugary coke if it's around. Another very useful treatment is Honey. Squeezable container... 2 "shots" in my mouth are quickly and easily swallowed. If someone else ever had to "treat"me for a low, squirts of honey are good (minimize risk of choking).
Starburst peppermints :3 = 15g. Carry them everywhere although I haven't had to use them much yet
I like to keep treatments for lows everywhere. Pop and juice can freeze in my car, and some candies can melt. So I tend to keep the glucose tabs there. Walking around, it's easy to keep the glucose tabs, Skittles or Rockets on me. At work, I have more options. I can keep juice or pop in my desk. I used to keep jellybeans on my desk, but my co-workers would steal them.
As for pop, I was always told no colas because they will bring up your sugars excessively and keep them up. I go with 7-Up or Sprite instead.