Looking at first toy. Some questions

Hey guys, I’m looking at aneros for my first toy and I have a couple questions.

1) Difference between helix classic, syn, and trident?
I know the syn is a different material, but any other differences?

2) is coconut oil safe to use with these? I saw a post from a while ago where it showed a moldy syn and the person admitted to using coconut oil. Would I be safe using it? I would clean it with soap and water each use.

3) Best place to order? I’ve been looking on shevibe mostly.

Thank you guys for the help!