I used, and was fairly happy with, a heavy duty 6" bench vise for my first 20 years of bowmaking, but then I built a new workbench and now I have 5 different types of vises in the shop. Three of which are used regularly for bow making. My trusted bench vise still gets used a lot, but also two types of patternmakers vises which I've really taken a shine to. They're versatile.
When I use the regular bench vise on bows that are far enough along that they need protection, I just slide a piece of 1/8" industrial strength rubber down into the vise. It protects the bow, and grips it well. I have the same rubber on my shavehorse.