I enjoyed HG more than i did the original silver or gold. Sapphire is one of my all time favorites. With that said, idk if any of them have as many hours as LG. I love gen 1, and the extra stuff in the end was pretty good.(some minor gripes but w/e)
I am not sure what i played more of when it comes to red, blue or yellow. i am guessing blue or yellow though i tended to play them somewhat evenly.
I have a few old gameboys and a regular old DS. I haven't bothered with any of the newer ones.