iternabe Yes, this is what make the GBC Proclick system in her video attractive to me. I am slowly accumulating loose leaf sheet music, some from my teacher, some my own creation in MuseScore. So I will need to be able to insert sheets to the binder, and replace pages should I find mistake and re-print.
IMO the GBC Proclick system is a newer concept than the classic comb binding machines and the advantage of direct inserting is something really useful.
This is how the classic machines work:
But he should flip the pages upside down, allowing him to add pages at the end. (Have seen a German video, and that guy did it the other way round for exactly that reason. And he explained, why.)
I think ANY ringbinding system is good, as along it allows inserting (or at least adding). And each system has its advantages and disadvantages. You will find a lot of information in the depths of the internet; but at a first glance I think the GBC Proclick is a good choice. A very good choice. It is basically designed for your usecase. Only if you print an entire book with 50+ sheets you will wish you had a bigger punching machine. Okay - a bigger machine exists, but it may be oversized for home user like you. (My machine plays in the same ballpark, and it is nice when I make a book with 100 sheets, but most of the time it consumes only desk space. It is oversized for me.)
About using a loose leaf binder: Nah - you won't go back to that after you've experienced the sleek comfort of a ring book. No way.
And making use of a binding service at a office supplier store is also no option. If you want to only exchange 1 sheet because you changed something with musescore, do you really want to go there every time?