Living in 2024 vs. 1984. Easy answer - 2024 for sure. The world is such a better place than it was 40 years ago.
2024 vs. 2064. More difficult answer. The trend lines for civilization are pointing upwards. 2064 is likely to be a much better place than 2024. My fears would be climate change (akin to people in the 80's rightly concerned about large scale nuclear war) and being out of place (I am assuming that I would be transported there as is. 40 years could be a lot of change to take in at once. I could be like some of the angry boomers on Sherdog who are so out of synch with life that they cannot enjoy a mainstream movie without sobbing). Medical advancements mean that I will likely be able to live longer in 2064 than I will in my current timeline.
I agree with you in relation to technological advancement and resource conservation.
But you have to consider that there will be more people 40 years from now. More people equates to more problems, numerically.
You have the perpetual culture war between the rich vs the middle vs the poor, partisan politics, the patriarchy vs increasingly aggressive feminist waves, uninspired educational systems, radicals in both political parties usurping power, growing racial divides, across the board declining creativity, declining attention spans, AI writing reports for rich kids to ensure they have access to the best careers, reaffirmation of a perpetual east vs west conflict, higher inflation, surging crime in all metropolitan cities, more unchecked military spending, more nuclear powers, more nuclear weapons, more homeless, more drug addiction, more riots, more police brutality, more youth flash mobs, more looting, higher taxes, more religious fundamentalism, more oligarchs, more debt, more control over reproduction, more surveillance, more inhumane treatment of animals, more pollution in developing countries, more deregulation of industries, more overregulation of industries, and so on and so on and so forth.
The question is, will more people also equate to more people doing more good deeds, or will we just have better technology?