Tape vs split loom

Alright, so I'm not sure if I'm about to kick up a storm here, but I was wondering the advantages/disadvantages of taping a harness vs split loom.

I've done a lot of electrical work in my life, but never really automotive electrical. Now that I'm getting under the dash, I'm finding that the previous owner may have been certifiable. I've had to stop out and replace a couple circuits and now I'm just about ready to get it all neat to tidy. In the past I've always gone for split look, but I know in the car world it's usually non adhesive tape.

Thoughts? Opinions?