I'd say they are simmilarly difficult, but Stairway is easier to memorize. If that kind of solos is what you like I suggest learning "Another Brick in the Wall", "Moonlight Shadow", "November Rain" and alike. They are not hard, but differ in style and phrasing and are loaded with nice licks. As you advance, you might want to try Satriani's "Always with me,...". It's a nice, emotional piece and most of the hard work is done by the left hand, so it requires less coordinating. Take your time and enjoy your playing.