Photography Paper Backdrops

Photography - Studio Backgrounds - Paper, vinyl or muslin?
Hi,
I am starting to purchase my photography studio and I was wondering, what is the best type of backdrop? or your preference / recommendations?
Also what are the pros and cons of the types of backdrops??
I want to know what type to purchase.
Thanks!
Muslin - pros - lightweight, washable (therefore reusable), easy to transport & store as it can be folded up. Cons - wrinkles easily - wrinkles can be ironed out though, or if you shoot with a shallow depth of field and/or expose the b/g 2-3 stops more than the subject, the wrinkles won't show. More expensive than paper.
Paper - pros - cheap. Cons - gets dirty & you have to throw away dirty sections. Heavy - you also need to store rolls of paper upright, or their weight if laid horizontally can cause a regular ripple throughout the backdrop from compression of the roll. Difficult to store (upright) and transport if more than 2m wide.
Vinyl - pros - very smooth, easily washable. Cons - same storage/transport problem as paper rolls. It's heavy. Reflections aren't a problem if you know how to light it properly.
I use muslin, just for ease of use & storage. Wrinkles/creases aren't an issue.
Choosing Photography Backdrops