Ergodox pioneered the genre of ortho split keyboard, but I don't think its the best in 2020. Minidox, Redox, Iris, Corn, Gergo all have better thumb clusters and are more compact.
Maltron pioneered the ortho split keyboard in 1980, and several companies made imitations since then -- Kinesis is best known, and is what the Ergodox was inspired by.
https://www.maltron.com/legacy-maltron-keyboards--archive.ht...