Comment by amluto

Late edit: one exception is A/V. Sometimes you want fiber for applications other than networking. There are A/V applications for fiber, for example. If you need this, use what the thing you’re using the fiber for requires, and consider putting it in conduit. If your application calls for MMF, consider using the highest grade you can get at a reasonable price, which is probably OM4.

Also, preterminated fiber is a thing. While it’s not that hard to terminate MMF, it’s still easier and more reliable to buy preterminated fiber. SMF terminations are apparently much more sensitive to being done perfectly, and buying preterminated fiber is wise. (I’ve never personally terminated any fiber, but I have installed and connected fiber, and it’s delightful to just plug it in.)