your negatives. your scanner. your files.
once you're developing your own film, scanning is the last thing standing between you and your photos. do it yourself and you control all of it: the crop, the color, the resolution, the files.
you also stop waiting on a lab, and you start to learn what your negatives actually look like before any software gets involved. that's the part that makes you better. the lab's scan is someone else's read on your photo. your scan is yours.
it pays for itself, too. lab scans run a few dollars a roll and pile up fast if you shoot a lot. a scanner is one purchase, and after that every roll you develop at home is basically free to digitize.
a full-res 35mm scan at 3600 dpi is roughly a 30 to 50 mb tiff, so keep an eye on drive space once you're archiving a lot of rolls.
short version: if you only shoot 35mm, go dedicated. if you shoot multiple formats or want to scan old prints too, go flatbed.
scan to tiff if you plan to edit much, because it holds more information and survives heavy adjustments. jpeg is fine for a quick share or a contact sheet, but it throws away a little data every time you save. a common workflow is to scan flat to tiff, edit in lightroom, then export jpegs for the web.
for resolution, think about the final use, not the biggest number your scanner offers. 2400 dpi already gives you a file big enough for an instagram post or a small print. 3600 covers just about any print you'll actually make. 7200 is for archiving or wall-sized enlargements, and it roughly triples your scan time and file size to get there.
you can also 'scan' by photographing your negatives with a digital camera and a macro lens, lit from behind by a bright, even light. it's fast once you're set up, and the quality is genuinely good.
the catch is the rig: you need the camera dead level to the film, a steady light source, and software to flip the negative into a positive. if you already own a mirrorless camera it's worth trying before you buy anything. if you don't, a dedicated scanner is simpler and cheaper to start with.