What advantage/disadvantage does the forster co-ax have over the lee?
Dies snap in to a slot rather than thread into tapped holes. They actually float freely making the die/brass case alignment precise. It also uses a "universal" shellholder. The Lee is a "conventional" press into which dies are threaded, and it uses shellholders specific to each caliber.
Treading lightly not to enrage the rather defensive Lee crowd who seem to be paranoid whenever someone "disses" Lee products, I would suggest you look at both and decide if the features of Forster Co-Ax justify its higher cost in comparison to the Lee. Some Lee products are inexpensive; others are cheap. The CC is inexpensive, not cheap. Both presses will load ammunition to your satisfaction. Personally, I chose the Co-Ax many years ago, have used a friend's CC, and it is a good press, but if I had to replace my press, I would opt for another Co-Ax rather than a CC. He bought the CC because it was what he could afford. But I probably won't have to buy another press as I have had my Co-Ax for well over 30 years and it is still as good today as the day I brought it home.