Check out the specs between the two. I think the MX5000 has more pto hp than the 4800. The 4800 is an ag tractor the Mx is "utility" tractor. Depending on your use the the heavier frame 4800 might be the right choice. Also I talked to an owner of a 4800 and the hp can be increased to make it 54 hp.
Mike
But I like my MX5000