The 7005 is the slightly more power amp with 60 watts into 8 ohms, not to be snuffed at really as it will give a bit more headroom. The 7005 was the predecessor of the award winning pm8005. I suppose it is still regarded as being in a higher tier than the 6006 model range. Would have been quite a bit more expensive than the 6006 on it's original release.
I would also say it depends on your listening habits. The CXA60 has a very entertaining “live” sound but can become tiring after a while. The Marantz may lack the dynamics but is easier to listen to for longer periods.