Hard to define "best value"...but I recently splashed out on one of these - it fits your specs.
https://www.bikeradar.com/reviews/bikes/road-bikes/2021giant-defy-advanced-pro-2-review/
Stocks for all brands are low or OOS, but found the right size and had a fitting at their city branch.
My priorities were ride quality, ride quality, ride quality.
Wasn't even sure I wanted discs, but every bike is some kind of compromise.
None of the short list bikes were available to test ride, so I cant compare.
So far I'm really impressed and really enjoying each ride more than the last.
(Sadly due to 'life', my rides are only about once a week at present but...)
One note that disappointed me. Bearing in mind that Giant manufacture every part of the frame set up, I would have appreciated being able to 'custom finish' the bike. The saddle is very comfy but about 1.5cm wider than my previous one and I'd have gone for a narrower one. IN practice I does feel a bit 'tight' at the top of the legs. Also I'm tall but with "very long legs" so the XL was the correct size. But I'm not built like Arnie across the shoulders and the 44cm wide handle bars feel huge after my previous bike - about 2.5cm wider really feels a lot. But to change these bits I would have had to buy the new parts at full price and pay the labour. I have therefore decided to see if I get used to them before splashing out. However at the time of sale the parts supplied were "NEW" and unused so some kind of deal where I paid for the labour and a restocking charge for items switched, would have given me much greater feeling of contentment that my bike was personalised for me. After all I paid extra to be fitted for the bike and it shouldn't stop at saddle, bar, cleat position. (To be fair I was pleased with the rest of the fitting.)
This is not a major problem. After all I bought from the biggest bike co in the world and not a LBS, so what did I expect? I believe I got a lot for my money but it didn't warm me to the brand GIANT.