Doesn't matter which clamp you get if you use it correctly. There are plenty of models out there. A single style clamp will work fine for repairs, or for making your own arrows. I liked my multi jig right from the start however.
I purchased my first Jo-Jan multi about 16 years ago. I still use it daily, along with others like it for shop use. I can't even begin to imagine how many thousands of arrows have been through them. Setting the jig to straight, Left/Right offset, or L/R helix is a snap too. They do however require different clamps, like the others do still.
I'm suprised one of the other companies hasn't made a multi jig yet. Its so much nicer to do a half dozen at a time on the same jig. They come out exactly the same every time. The rotating table with many single clamps works well also, but is a very, very expensive way to go.
As mentioned above, you can get glue on the clamps. It is a good idea to use tape to protect your clamps. It makes it very easy to clean excess glue from them as well.
JMO,
Jerry