For me it's a three way tie between Curry, G&G (1988) and T/D (1984). All three were utterly flawless and set new standards for their disciplines for decades.
I think the poll is seemingly about just single skaters from a limited era. It is really hard to judge skaters across disciplines, and time eras in any meaningful way. Orser had a better LP than Boitano, he won the LP but not the gold. The best doesn't always win in a judged sport.
For the group listed above, for me it's between Yagudin and YuNa. Both of them were the front-runners and held up under the monumental pressure, and neither skated conservatively: both gave their all. Also, they happen to be skaters whose style I love. Yes, Lipinski did a wonderful job, but her style was a bit little-girl for me, especially in comparison to Michelle, whose Lyra Angelica is one of the great artistic masterpieces ever (and is pretty good athletically, too). By contrast, Yagudin and YuNa I could watch again and again.