I’m in the same boat and considering the same receivers... all 3 support HDR with HDR10/Dolby Vision/HLG, 4K, HDMI 2.0 and HDCP2.2a. One thing to note, Onkyo has dropped Audyssey EQ for their own proprietary EQ program that is widely considered to be merely acceptable, and much less effective than Audyssey. Onkyo also has had bad QC in the last few years, with HDMI boards failing and units overheating, losing video, etc.
The Sony doesn’t support 4 ohm speakers, if that matters to you.
I’ve also added the Denon 3300 & 4300 to my list for the pre-outs, more advanced Audyssey MultEQ XT32 and 11.2ch processing for future expansion. Pricey, but I’m weighing the cost of upgrading later vs. biting the bullet now.
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Denon AVR-X4300H, 5.1 KEF Q100's w/Q200C center, SVS PB1000 on the way. 50" Panasonic Plasma (3D), Xbox One
Previous build - Onkyo HT-S6800 7.1 w/ Infinity Primus P262 towers & PC351 Center, BIC America V1220 sub & 52" Sony XBR LCD