Which statistic site is reputable?

That changes like every day, depending on who you talk to. I got told that op.gg wasnt reputable so suddenly my argument didnt work. But neither is lolalytics or champion.gg or leagueofgraphs. So who the fuck knows

All of them will be semi accurate while none are 100% accurate. It is just a matter of which one you like using the best. My personal favorite is https://www.leagueofgraphs.com/ which shows champion counters, rune builds, item builds, skill orders, top summoners (best players with that champion which you can then inspect their personal builds or even watch their recent games), and more.