So you're going to reply to my link with the link just in case?
Considering you asked the specific question regarding a link then the answer would be "yes".
Regarding your initial question about the 6014 vs 6015 I suggest going to the Marantz site and comparing specs.
Offering an alternative to Marantz...depends, some love Marantz while others prefer other brands.
Denon seems to be the brand leader in general but that is for the buyer to decide upon.
I just listened to a podcast interview with Sound United regarding the sound differences between Denon and Marantz and the interviewee stated that the Denon was designed to have more of a "in your face" sound while Marantz was designed to be less so and perhaps a bit more smooth.
I've listened to both over the years and agree with the interviewee and for my ears the Marantz sounds better.
Decide what you need the avr to do, how much you have to spend then compare and listen, or at least google for reviews and read forums then make your decision.