By far PRIDE is the superior of the two, when you compare a UFC event to a PRIDE event UFC is like a house show and PRIDE is like a Wrestlemania. PRIDE has great production and overall fans where the fans actually are knowledgable of the fighters, also PRIDE has some of the best fighters in the world, but to be fair UFC has some good ones too but in my opinion they deserve to be in PRIDE. PRIDE has bigger paydays and purses for the fighters also.
The biggest difference between PRIDE and the UFC are the rules, and the ring/cage. Some fighters and fans prefer the cage some prefer the ring, I particulary like the ring cause it's a more fair fight, the fighters opponent dosnt have a chance to stack them up against the cage and ground and pound them, PRIDE has more brutal rules also with kicks to the head on downed opponents for example.
If you're going to see a PRIDE event find the Japanese pay per view of the event, that's the purest form you'll see a great PRIDE event in, the american PRIDE pay per views are watered down and edited due to time restraints.
"Where there's a will..."