Based on our record, Musicroamer seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Seeing as how you commented elsewhere that you're prepping for a DJ set, presumably for a genre you don't know too well, you might want to stick the relevant musicians in Ishkur's Guide to Electronic Music into a portal like Music-Map, Gnoosic, or Music Roamer to see what else comes up. Source: about 2 years ago
I took OP's question as a media discovery tool for Lidarr and not so much the request management side of things, but I could be wrong. I'd be interested in the media discovery side of things. I often play around in MusicRoamer, but it's not at all linked to Lidarr. Source: about 2 years ago
Songlink - Share music with anyone.
TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.
humit - A social networking app for music sharing and discovery.
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.
aux.app - A free web-based music platform to play music from other popular online streaming services.
Gnoosic - Even if you don't know what you are looking for - gnod will find it.