My four favorite 4K disc players happen to include those two Xbox consoles and a pair of Sony models -- the newest is from 2018. Manufacturers are keeping these players around for longer now that their popularity is waning, but they're still my top recommendations.
The Sony UBP-X700 is at the cutting edge of 4K Blu-ray technology thanks in part to its Dolby Vision compatibility. Throw in a bunch of streaming services and the Sony rewards you with a solid performance at a reasonable price. Read our Sony UBP-X700 review.
If you want to spend a bare minimum on a 4K Blu-ray player then the Sony BDP-S3700 Blu-ray player is your choice. It offers a lot of features for little money, though not Dolby Vision. Not that it's a bit slower compared to other players. Read our Sony BDP-S3700 review.
The PlayStation 5 and Xbox Series X are both slated to arrive by the end of 2020. Until then, your best non-PC option for 4K gaming and Blu-ray on your TV is the Xbox One X, which delivers superior graphics on many Xbox titles, as well as a full 4K HDR Blu-ray watching experience. (Sony's PS4 Pro supports 4K gaming, but doesn't play 4K Blu-rays.) Note that stock on the Xbox One X has been very low in recent weeks. Ideally, you want to find this model for $399 or less, and bundled with a game (there are several bundles). Read our Microsoft Xbox One X review.
If you want 4K Blu-ray compatibility but can live without 4K gaming, the Xbox One S splits the difference along those lines, and saves you a few bucks in the process. The One S is a bit easier to find than the One X -- look to pay about $299 with a bundled game included. Read our Microsoft Xbox One S review.