While I do think green lasers are cooler due to the added complexity in the design, the fact that they're brighter, and you can see the beam much more easily... my personal favorite between the two is still red. Not only do I find the red color more pleasing to my eye, I think there's also some nostalgia involved too. I remember playing with red lasers ever since I was a little kid and thinking how cool they were, whereas I had never seen or used a green laser pointer until I was well into adulthood.
What's your personal favorite and why?
What's your personal favorite and why?