There is the vpme Zeroscope which is ~180€ built and takes 6hp for 2 channels.
Compared to it and the Mordax Data, the Korg offering is interesting.
Personally, I use an Expert Sleepers ES-9 connected to my laptop with VCV Rack scopes and spectrum analyzers. The ES-9 is a great Swiss army knife module, albeit greedy on the +12V rail and somewhat costly. I'm still longing for a proper 4 channels scope.