I like the Biotene because even with my pretty dry mouth, it doesn't stick to my teeth. At the end of the day, since I use their toothpaste and mouthwash, I'm not sure that the enzymes in the gum are that much more additive to the whole thing. As long as it is sugar free, and particularly xylitol sweetened (which actually can be helpful in preventing decay), I would go with what you like.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.