Over the years I've used vises from Renzetti, Dyna-King, and HMH. Currently I'm using a Regal with the stainless steel jaws and love it. I tie mostly between #14 and #26 with the occasional #8 or #6 streamer thrown in and have never had a hook slip even the slightest amount. This vise sees easily over a thousand flies a year and it has performed flawlessly for me. The stainless jaws are much more resistant to chipping than the standard Regal jaws and they allow much greater hook access, even more so than the midge jaws that Regal offers. One of the biggest advantages to the Regal is that you don't need to make any adjustments when switching between hook sizes. You can go from size #1/0 Salmon flies to #10 Woolly Buggers to #24 Zebra Midges with NO adjustments. Although the Regal is not "true-rotary" it still allows the jaws to be rotated 360 to view the fly from other sides.
That being said, just because I love this vise, you may not. I would strongly recommend going to a shop, or better yet, a few shops, and trying out as many different vises from as many different manufacturers as you can. Any quality shop will be more than happy to let you try out the vises and when you finally find "the one", believe me, you'll know it. Honestly you can't really go wrong with any of the manufacturers listed above. They all put out some really great products and equally, they all have their own unique drawbacks and limitations. It's just a matter of of finding the one that best suits YOU and YOUR own tying style and needs.