I have actually read multiple studies where they have stated that conservative are significantly happier than liberals when economic status and multiple factors are equalised.Especially among millennials and Gen Z the difference of opinion and mindset across the aisle has never been greater.
How have your experiences been with both of these people and does this hold true around you as well?
Please don't make up stories (A sincere request).
I would suggest that people with a conservative or right-wing mentality have a tendency to be motivated largely by self-interest, and have little to zero concern about the conditions and well-being of the wider population. Whereas those with a left-wing mentality, whilst certainly still having a degree of self-interest, want to reduce suffering and inequality across the whole of society (and ideally the world).
If a study focuses solely on the economic status of the individual being surveyed, then whoever is running the study is missing the point. Bernie Sanders is comparatively wealthy, but is unhappy about the treatment of those less fortunate than himself. Trump is rich and is only unhappy about things that impact himself.