9anime.to is the best there is. Has an absolutely massive catalog of TV, OVA, and Movie releases. Streams are almost always very high quality. Idk about 4K support, but most shows are 1080p. Make sure you use a very good ad and pop-up blocker, the site is loaded with them. On mobile I use adblock browser and it works perfectly.
Consider ddling through xdcc as an alternative to torrenting if you don't have a vpn. Quality will likely be better than you can find on any streaming site.