I like both. Here's my honest opinion:
The first two seasons of Enterprise are often terrible, it's third season is my favourite Trek season ever (it's cheesy, but a good
cheesy) and the fourth season is pandering TOS fanwank. Unless you're a die-hard fan you often won't have a clue what's going on. The finale is an awful TNG holodeck episode.
TNG is slow-paced, early-90's ultra PC fare. The first season is awful, and it's often bland, but it has some great episodes. Some of it's ideals are dated. Some episodes are utter garbage.