Just use a camera and a copy stand. I bought one of those cheapo scanners and copied all my old slides and photos, and what few negatives I could find. (I was awful about keeping that stuff together back in the day). Unless you spend decent bucks on something like an Epson photo scanner, those cheap scanners turn out poor results. I redid everything with a copy stand I found on
eBay and digital camera. If you shoot in RAW, you get a raw image you can play with to some degree. I use this same setup to scan negatives when I shoot film, rather than develop images in a darkroom.
They key to this setup is the right lens so you can fully fill the frame with whatever you're scanning, otherwise you have wasted pixels. This is going to happen with different formats regardless, like 120 film Vs. 35, etc. You can minimize it with a close-focusing lens.
For doing negatives I bought a cheap LED light table from Amazon. Trick: Take a shot of the LED table by itself first and use it for white balance. For photos use multiple indirect lights to avoid glare.
Lastly, shoot at an aperture that provides enough depth of field so that any waviness in old photos or negatives that you can't flatten out will be in focus. A razor-thing DOF here is your enemy.