1985 was better overall
2015 is better overall
Technology is certainly better. The availability of cheap things. Things that have gotten worse include the economy (progressively have gotten worse since the 80s due to a shift to neoliberalism) individual risks including job security, individual debt, retirement...., childhood poverty.
The poll is tied right now. I bet if we had done this same poll in 1985 (vs 1955), it would be about even also. And if we had done the poll in 1955 (vs 1925) it would be even again. Over a thirty year time period, probably about half of the people are going to remember the old days as the "good ole days".
Yet if we had asked if we were better off today than in 1915, probably on one or two people would have responded that things were better in 1915.
although I suppose if one was gay, or got diagnosed with blood cancer, or any cancer for that matter. would 2015