I have recently chosen to purchase an Integra DRX 3.4... which I am very happy with.
My own thinking in terms of shortlisting.
1) In terms of performance, some of the top contenders have had disappointing results when measured (NAD, Arcam, JBL)
2) For what I am looking for, I want a good performing Pre section (DACS and DSP, decoders etc...) - the amp section should be either adequate for surrounds and heights with pre-outs for the fron L/C/R or capable of handling 2ohm speakers with competence ... mostly that means it has to have pre-outs. (my main speakers are low impedance woofer drops to 3 ohm and tweeter is at 1.6 ohm - midrange is easy...)
3) Want 5.1.4 - as my intention is to expand my 5.1 setup to 5.1.4 at some point
4) would like to have Auro3D (but not critical)
5) Must have either Audyssey XT32 or Dirac - Dirac preferred due to having used Audyssey based systems for over 10 years with nothing but disappointment... the new Audyssey app should overcome my issues with it... but have been impressed by Dirac at audio shows - in stereo setups hence my preference
My shortlist ended up being Onkyo/Integra/Pioneer/Denon ... Marantz got pushed out of the list for cost/value reasons as well as underperforming compared to its Denon stablemate - Anthems were too expensive
In the end, I found I could get an Integra 3.4 for around 30% less than the Denon X3700 - it has ample power for surrounds and heights internally, and pre-outs so I can run my external amps with it for my difficult fronts. - Considered the Onkyo RZ50 (and its siblings) - but I would have been paying more, for additional power I don't need... so the Integra 3.4, was my best value alternative. (also based on the market in Australia - pricing does vary by region, and so do the differentials between siblings Onkyo / Integra / Pionneer and their competitors)