You have to measure your knee
There’s a guide in the description here Iron Bull Strength Knee Sleeves 7mm (1 Pair) - High Performance Knee Sleeve Support for Weight Lifting, Cross Training & Powerlifting - Best Knee Wraps & Straps Compression - for Men and Women https://www.amazon.com/dp/B06ZXY4LK4/ref=cm_sw_r_cp_tai_0sIkFbB1WWRRB
i've been using these: https://www.amazon.com/Iron-Bull-Strength-Knee-Sleeves/dp/B06ZXY4LK4/ref=sr_1_3?ie=UTF8&qid=1549919265&sr=8-3&keywords=SBD+knee+sleeves
I've had some knee issues in the past and they have been working well. The caveat is that I haven't really tried many other brands so I'm not sure if the quality/price is really "the best," but they've been working for me. I don't do a ton of straight-up running--I mostly do lifting and some CrossFit. So, I can't speak to what the best thing would be for someone who wants to run long distance (and by that I mean more than like, 20 ish minutes).