I can't imagine life without my fuzzy wall! ....... I'm lucky, as I had the luxury of space, and have a permanently mounted design wall 7-1/2 ft x 10 ft! All in black polar fleece. And for the OBW, it's been a real blessing!
For a temporary trial design wall, tape any of the fabrics to your wall with painters tape. That's how I tried out flannel backed table cloths, then flannelette ... then the polar fleece.
Things held better to the polar fleece .... plus it gave me 60" to work with, which was nice when I covered each of the 4x8 (cut to7-1/2) sheets of tentest. Then screwed them to the wall.
As far as fabric staying on ... I've NEVER used pins (though they do stick in ther every easily). I've had some pretty big pieces up there .... in the fall I had a 50x70 on my design wall for 2 weeks, before it went to the LAQ ........ never budged one little bit!
Best. Thing. Ever! :)