The vices clamp is made from metal. This metal needs to match the job requirements too. That is mostly the real difference between the vices. Some vices clamps can actually \"chip\", meaning the the very tip of the clamp breaks off when holding the hook. So be aware of that when setting the hook in. Don´t grab the hook too short, or too much, in front of the clamp.
The clamp is closed in different ways.
a) a spring loaded mechanism which is forced open via a lever and closes by itself. The Regal vice is the most known, but also expensive example. There are \"copies\" of the Regal on the marked, mostly from India or Pakistan. They work equally well, apart from the metal of the jaws. It can chip more easily compared to the stainless steel jaws of the Regal. If you consider a Regal, make sure you get one with the stainless steel jaws. Stonfo also has a spring loaded vice which gained a lot of popularity lately
b) Screws. One or two screws pulling the jaws together. There are a few examples out there which use this approach in a very successful way. These vices sport rather big enough screws.
c) There are various apparatuses combining a screw and lever mechanism pushing the jaws together.
d) The other approach is to stop the hook from rotating - as I would describe it. This needs much less force and so does not put as much stress onto the hook. The hook is held in an eye at the end of a long screw which is pulled in against a surface.
I tried to describe them technically without rating and leave it to you to decide which type of mechanism appeals the most to you.
Budget, is also a question which is up to you. You get what you need in a vice for under 50 dollars. Everything more is fancy and appeals to the fisherman (and his pals) - which of course is something people are very happy to pay a lot of money for. The latest I heard of was vice for 1.175 GBP which per today is 1.500 USD - that is onethousandfivehundred bucks, dough, bread, tamales, scratch, moolah, cheddar, Cheese, guap, lettuce, paper, scrilla, scrill, stash, chips, cake, cabbage, Benjamin, Benji, loot smackers, simoleons, ducats or whatever you preferred nomenclature is ... OK, the flies of that thing come with a catch guaranty, I´m sure ................. not.