first, interchangeable tips are a pain in the ***.
second, weak and flexible snap ring pliers are also a pain in the ***. you want something solid and well made.
i have the craftsman that are fixed tip but change between internal and external. they are okay, not great. padronanniversary mentioned the knipex set. if you can afford that set, or find them on blowout (as he mentioned), buy them.
i have a couple vintage vespas and my wife has a third. vespas have an insane amount of snap rings. after i have completely upgraded my work tools, i am going to buy the knipex set.