In the beginning, I only have a very few pliers. When I need to open and/or close jump rings, I used chain nose pliers as that's the only option that I have.
Sometimes I found it's a bit difficult to hold the jump rings with this pliers, especially for bigger size of jump rings.
Eventually, I bought more and more pliers in different types and sizes. I found out that using flat nose pliers is much easier to open and close big jump rings, while chain nose pliers are great when working with small size jump rings. It's also much easier if both pliers are of the same type and size.