Hi Bachus
I think for me, it's more to follow with favourite brand, rather than favourite keyboard.
Late 80's to 2004, I luved the Technics range, had about 8 of them over that period including the synth ,arranger module and arranger piano.
Also had a couple of Roland's a Yamaha and and the korg i2 ( there first arranger) during that period.

Post Technics, tried PSR, Ketron and thankfully rediscovered korg ( pa800) .
I think korg for me has taken over where technics left off.