Oh lord, don't use either material! Both are extremely porous. Any bacteria (like those found in body fluids or inside the anus) will be trapped inside and will never come out. Those bacteria will breed, making the toys very unhealthy to use. Even a brand new UR3 or Cyberskin toy is dangerous because both materials are known to contain pthalates and to leech toxic chemicals. Making a bad thing even worse, both materials can tear making it bad for body suits.
What you want is Rubber most likely. Clothing grade sheet rubber isn't cheap, but it can stretch nicely if you choose the correct kind and can be slicked down with lube for that "inside feel". You can also try to get skin or leather textured rubber or add a texture yourself.
Here's a useful page on the kinds and thicknesses of sheet latex.Stretchy Spandex fabric is even safer as it should breathe naturally but it won't feel like skin. You could try texturing it with craft-grade liquid latex, but there's no guarantee it will stick to the fabric so test patches are needed.
Either way, air holes are still important and you'll probably want to base the design on a
Zentai Catsuit. You should refrain from adding fur to the outside as fur doesn't stretch. If you must have fur, make a large "belly pouch" and "Throat tunnel" out of fur with a smaller "belly pouch" and "Throat tunnel" out of Spandex or latex on the inside and it might work. Measurements here are key as the seams on the fur may burst if measured incorrectly.
