You get XLR with this one the Denon doesn't, if you need that sort of connection.

As far as the 4 ohm I beleive Marantz usually works quite well and the THX certification IIRC means it is supposed to handle loads down to 3ohms and the amp to go with it is $2400

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70