Yellow - I recall no cattle guards on Monitor.

Monitor's a lot drier. More the type of terrain you'll get at ESDC (eastern Sierra like). The view from Monitor can be amazing. Ebbets is pine foresty and just beautiful. Ebbett's is the hardest of the passes in terms of steepness, but done on its own it's a fun ride. Carson's easy, flattish (except at the bottom and top), meadow with lakes.