The AVM 70 is cheaper and I would take it over the Marantz all day. However, at the price of the AV10 the better comparison would be the AVM 90 and I'd take that over everything under 15k.
Marantz is a great brand but not really my taste sonically, little to dark for me. Also, the Marantz now employs Dirac live capability which is great if you are a techy guy that likes to tweak. Otherwise Anthems ARC is by far easier to use and will get you to about 95% of the same end point as Dirac. That last 5% is if you want to tweak every frequency of every speaker btw.