As hard as it is buying runes in general, I'm completely lost when it comes to buying Quints. Are there any generally good ones, like movement speed? I try to have a page for AD, AP, and Tank so far. If I need something more specific, my current mains are Sivir, Morg, Braum, Leona, Sejuani, and Sion.
AD, AP, and MS are probably the most generic ones. Health or %Health can work for tanks, some might also work with armor/MR.
LS used to be popular for ADCs, but they got nerfed a bit and now Doran's Blade has LS rather than just "gain X health per auto", so people mostly shifted back to AD.
Beyond that you're getting into fairly specialized territory.
For AD: Flat AD quints For AP: Flat AP quints For junglers: Flat movement speed quints For tank supports or tank top laners : Flat armor quints
Aside from that, there's also Lifesteal quints that can be purchased on ADCs and some auto attacking top laners, but I would only put 2 of them along with 1 AD quint. It's up to you to choose now!
