How familiar are you with anal play? The Sasha Grey plug is considerably larger than the other two and makes it not for beginners. So if you are looking for some stretch back there, then that might be the right choice. If you are looking it wear it during intercourse and have it push your partner toward your g-spot, then the Icicles #14 might be the way to go. If you are looking for a long term wear plug, then Moon shine might be just the ticket. It all depends on what you are looking for.

I like the look of the Icicles #14 best, the bases on the other two look like they might be a pain to fiddle with when you're pulling out the plug (and as Jimbo Jones said, the Sasha Grey is huuuuuuge.)

I say the same as Jimbo...depends on your anal play level and what you plan on using it for. BUT, I thought glass plugs weren't the best to use for long term wear though? I thought they would hurt badly?

If you like big toys I would get the Sasha Grey plug.

I also kinda like the Icicles, but it depends a lot what you're really looking for.