I have both a monorail and a field 4x5. I find the field unit (linhof Tech III) a dream to use especially for a quick setup(rapidly changing light). But for absolute flexibility i.e. architecture subjects you can't beat a full featured monorail. When I take a road trip I have the linhof setup for handheld exposures with a 150mm lens the monorail setup with a 180mm lens both on their own tripod and a 5x7 with a 13in lens. So welcome to the club.