There was a thread for this topic on the History forum back in 2019 (
Best playoff performance individually since 2000?). The clear winners then, by 71 people voting, were:
47% -- Malkin 2009
27% -- Giguere 2003
11% -- Thomas, 2011
Nobody else received more than 1 vote, except for Jonathan Quick, who got five votes (7%).
It's a little surprising to me that Thomas received as few votes as he did, but I guess the counter-argument to him is that Boston's defence was so strong that even an average goalie would have a chance to win (of course, you can say the same for any goalie on a great club). I think Giguere being a bit lower is correct, just because he wasn't that great in the Finals (he was lights-out in every round prior).
If we did this vote again today, I'd be pretty sure that Kucherov '20 and '21, Vasilevskiy '21, Makar '22, and McDavid '24 would get some love.