KYB or Koni?

FWIW many Koni shocks are rebuildable.
Further there are many aftermarket tuner who can change Koni valving to ones liking.
I'd say those are strong benefits.

The "whole hog" are coil overs. Ability to change spring rates & "sag", ride height adjustability, oil viscosity change-ability, increased oil capacity for heat reduction, gas rechargeable to keep pressures in spec, compression and rebound (hi and lo speed) adjust-ability. Then there is corner weighting and alignment specs. Big bucks IMO.

I don't have a comparison comment on KYB vs Koni and the suspension desires the OP wishes.

Best of luck.