Well tbh, I would calculate two or even three possible moves. If they chose the one I most anticipated and mapped out, the quicker I would move.
Fischer was my idol as a youngster. As an adult, if I want to see beauty I look at Mikhail Tal or Paul Morphy. Their games were magnificant even if against lower skill challengers, their creativity, especially Tals wild and reckless style; was to be admired against their peers, which is the only real fair comparisons imo. Their chess was far more beautiful than todays machine driven figured-out chess or even Karpovs perfect position chess style.
Morphy for his time, was basically unbeatable and he took all comers. He was essentially a chess computer before his time.
For end game, it's universally accepted that no one touches Magnus. His end game dominance, which so many GM matches obviously end up, is frighteningly accurate.