I'm sure there's more types than we can buy LOL.
I've tried a lot over the years then decided to try Fons & Porter ripper. I really like it -- it's very sharp and has a good handle balance and comfort making ripping a little easier.
I also have one of those "knife" types that are extremely sharp. I've put holes in fabric and my fingers using this one so only use it now for cutting open button holes and magnetic snap prongs. It's a great ripper but oh so sharp.