On the LG CS I recently purchased Dolby Vision definitely looks better than HDR10. Especially if HDR10 is turned on in the MSFS setting highlights are way overblown. MSFS might not natively support DV, but to me it looks better and more natural than HDR10. No doubt about that.
At the end of the day there is not necessarily one single truth. Just go with whatever looks best to you and enjoy simming!