The purpose of reviewing Blu Ray players isn't to solely check if it can bit stream a clean audio signal or not. It combines several things such as the transport quality, the software, the load times and video rendering capability. The latter is the most important.
I would not bother with the Yamaha. Not because it does not mention anything around Atmos, as this is less of an issue. The X800 is a stellar player.
I cannot find a Sony X800 listed on the India website. If you can source one, nothing like it. A far superior alternative is the Panasonic DP-UB820, though at a higher price. Unless you are spinning a lot of 4k HDR Dolby Vision disc (Provided your display can support it too), I would not bother.
29K for a Sony X700 is way too much.
There are cheaper alternatives from Samsung such as the BD-H6500 but I see that Samsung India do not even have Blu Ray players listed. This player rivals the likes of an Oppo 103D.
We are not a big Blu Ray market which results in very limited options for top notch players.