Recently I discovered the work of the channel Mind Amend and their Techno focus tracks with isochronic tones. Super cool stuff! Upbeat, positive and good quality. Wide variety of styles, and effective.
Pure tones are also good, but today I'm trying some "hemi-sync style stuff" which feels okay, and different to the rest.
There's a huge variety out there. What works for you? What do you enjoy?