Which should I get: vice or device?

Get the Vice. The vibe is good, but it could be stronger. With the vibe removed, the neck has more flexibility than if it was solid silicone. That also means it squeezes with sphincter contractions instead of being solid. Personally, I like that. And with the vibe in and off, it's basically a DeVice. So really, the Vice is the best choice...in my opinion.

You might also want to try a NobEssence Romp. I own one and it was worth every penny. Like the Vice, the Romp is also basically two toys in one, because it's just as good backwards. Foreward, it's like an Aneros, but different (unrelenting, but never uncomfortable). Backwards, it's a perfect plug that gently cradles your prostate. Very comfortable...and very stimulating 😉

They're both massive and IMO so big that they don't do much of anything, least for me.

[EDIT] deleted because I didn't need to say anything.