I enjoy both but like the lathe a bit more. Part of it is eyesight and ergonomics; I can see what's going on with the lathe better, and can get in there with a magnifier when necessary (I make a lot of small stuff). The mill tends to be physically awkward for me. Also, lathes have fun things like change gears and all sorts of different custom ground tools. Unless you have a geared dividing head, the mill is less interesting, though gear making is fun. IMHO, you can generally do more accurate parts on a lathe.