There’s no arguing it - Korg did the mini-synth thing before Teenage Engineering. Actually, Korg, Roland, Moog and Waldorf (among others) all did it before Teenage Engineering.

As a musician and synth lover, I don’t know anyone who uses the TE gear as a serious musical equipment. They’re widely considered to be in the toy or novelty realm, except the OP-1, which is saved by being absurdly expensive for what it is.