HDR is part of what you buy into now with an UHD TV, but unfortunately whilst every TV is sold as HDR, true HDR costs a premium. To be future proof with the PS5 and for titles in HDR on Netflix you need to think about spending more money.
At the moment there are some good deals on old stock like this if you can still find one:
Buy Sony 55 Inch KD55XF9005BU Smart 4K HDR LED TV at Argos. Thousands of products for same day delivery £3.95, or fast store collection.
www.argos.co.uk
or alternatively there's refurb deals on the Sony XG9505 or XF9005 mentioned here:
To coincide with the Bargain - Panasonic refurbished eBay store thread I am also making this thread to stay as a bargain thread throughout the year. Much the same as the Panasonic thread, deals on this outlet tend to peak around this time of year (25/03/20 today) as they are trying to ship out...
www.avforums.com
If you treat the TV strictly for non-HDR purposes, either of the models you picked out is fine. They are both more than good enough provided you don't use HDR content. With cheaper TVs especially you should decide which panel suits you best, before picking out specific models.