I'm about 8 x 6 and I would recommend the Fleshlight Vortex. I also own the STU. At first, I thought the STU was too snug for me. I felt like my dick was mashing down the raised bumps as I thrust in and out of it. I had to trim the sleeve's outer ribs a bit so I fit into it better.
Once I trimmed them, a little at a time, I noticed it felt SO much better and the bumps were finally able to massage the length of my cock, giving me a more intense orgasm. Now it feels the way it was supposed to. Depending on your girth, you may not need to do anything.
The Vortex was wonderful from the get-go. The swirling, twisty, segmented interior will drive you crazy with desire. It never fails to give me a ball-draining orgasm, sometimes a few times a day.
And the great part is...both of them are ready whenever I am!!!