Based on what?
Marantz makes some very competent receivers and pre/pro components. Sure, if you think $10k+ is 'needed' for your components it could be better, but for options <$2-3k they are FANTASTIC.
Also confused as to why you state this, and then later in the thread recommend Denon?
I will confirm that Marantz is a little more 'musical' and is a better fit for more music vs. movies compared to the Denon (I have listened to most 5xxx , 6xxx and 7xxx models since 2014) and the Denon equivalents. Both are very good options in the $1-2k ranges.
Personally, I am ok with forgoing some of the features that Denon includes and opting for Marantz due to better-quality caps and better customer service. Having been burned by a poor Denon receiver and sub-par service in the past, Maranatz is a better option here IMHO.
I said what I said about Marantz because of what happens over and over again in the audio world. A company is well known for high quality sound (Marantz) thanks to their design (and pricing typically). Then a company buys the brand. The models that made the brand great in the past are abandoned. New models are introduced based on other brands the corporation owns (Denon) with slightly better amplifiers and have the newly purchased brand attached (Marantz instead of Denon). Even Porsche shares designs with VW now that they are under the same umbrella.
The internals of Marantz and Denon are nearly identical. The only differences for the price:
1) Denon has more features
2) Marantz have a SLIGHTLY better amplifier stage (thanks to the HDAM pre-amps)
3) Warranty: I think that you are correct that Marantz warranty is are slightly better than the Denon X series.
I recommend Denon typically because for most people, they are better off with the better feature set for movies and they want "good enough" sound quality. It literally comes down to:
1) Want the thing for movies? Get the Denon
2) Want this for music? get the Marantz
I hope you are not buying Marantz because they are more reliable than Denon. It's hard to fathom that that is the case if the internals are nearly identical.