As part of several design teams, Graviman, I can assure you once a helo design spends the effort to retract its gear, the few advantages of skids vanishes, and the advantages of wheels predominates.
Advantages
Skids - Cheap, simple, a bit lighter
Wheels - Operationally much more suitable - taxi without wind, turning, towing, running takeoff and landing, slope operations, rough field operations, smoother touchdowns, less gear penetration on soft terrain (less landing footprint pressure)
Disadvantages
Skids - more dangerous due to entrapment/dynamic rollover and running landing rollover; no braking control, poorer running takeoff capability, poor ground handling, hover taxi required (and its bothersome downwash). High drag
Wheels - higher maintenance, somewhat higher weight, higher cost