“Best” is probably going to be private torrent trackers.
But if you meant public torrent indexers then the top ones in terms of web traffic are 1337x, ruTracker, TPB, Rutor, & TorrentGalaxy.
Most people that were using RARBG have ended up at 1337x and TorrentGalaxy.
For what it’s worth if you just need a website to search the old RARBG torrents https://rarbg.best might be a good fit.
PS A lot of these sites are also linked at the other torrent site community [email protected]
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Just use qBittorrent and integrate Jackett search into it. You can search all your favourite torrent sites within seconds. The best casual setup out there
How do you integrate Jakett search, do you have to install Jackett separately?
Yes. Follow the relevant Jackett installation instructions. Set it up as you wish.
Then configure it to work inside qBittorrent.