If you want a scan once and be done then a graphic arts scanner is the way to go. Get one of the good ones. There is enough space on the bed to do multiple larger negs at a time and quite a lot of smaller ones. Setup is going to burn a lot of time though. Once setup, you can go eat dinner or whatever until you need to setup again.
Frankly though if you have that much to do, you are going to be doing it a looooong time, especially if you want the highest quality out of everything.
I'm not convinced on camera scanning yet. With the technical challenges of it, it can be a pain. You really need a laser to align everything. Special lenses, lightsources (if you are doing color). And you have to deal with every neg as an individual entity. Setting it all up is a pain. Plus to get the highest quality out of it, you are going to have to spend some bucks. And don't believe the whole "stitching is a breeze" spiel for larger negs because it isn't. It is the most labor intensive way to scan as well. For one shot 35mm it is pretty damn good though. If the majority of your negs are not 35mm then take a pass.
If you have the scratch you should hire someone to do it after you buy the equipment. Maybe get a college student to come in and do it for you. In 2012 I scanned everything (five stuffed binders) I made before I started scanning everything as I shot it in 2007. It took me more than a month working on it every day, all day, nothing else. And that was just for catalog quality scans just so I could see the images. 16 binders? That is going to be a massive amount of work. It is worth it in the end though. I found all kinds of stuff languishing in those binders.
You should also come up with a system to catalog everything before you start, if you don't already have one, so you can go back later and find a neg easily. Lightroom is by far the best program to keep track of everything. Year shot-roll #-neg # is the easiest most logical way. so 2022-001-36.
Hope that helps you.
