Polar fleece can make hiding seams tricky. But if you're doing live shows, the whole seam thing can be a non-issue.
The main reason to hide seams is for TV work. The camera gets a lot closer to your puppets than an audience does. Usually. Can't make a definitive statement there, but USUALLY...
Polar fleece is generally finer and more soft than antron, so if you're making a puppet that's going to be touched, polar fleece will make it more friendly.
If you're making puppets for heavy use and want to use a more affordable fabric (as you'll be rebuilding frequently), polar fleece is a good way to go.
-Gordon
I'm going back and reading some of the Tutorials regarding using Antron Fleece, do you really have to shave it before using?
I never had to shave it -- though I sort of like the kind of knobby look. Polar Fleece will actually do that after a while as well -- I've had pretty good luck making polar fleece look like Antron by using a hair brush (with bristles -- not a comb) lightly on all of the seams. It'll basically pull up the pile and hide them.
The real drawback is that they don't last nearly as long. I have a Polar Fleece puppet on my desk that's almost identical to a puppet I built out of Antron a year later. The Polar fleece one is dirty and looks about 5 years older than the Antron one.
My suggestion is to use Antron on any puppets you're going to use for awhile (and will be examined with closer scrutiny) and use Polar for background characters and cameos. Still -- the Polar one I have worked at least two conventions before showing wear and tear -- that's 8 days of excessive handling for 12 hours a day, if that helps.