Pacquiao-Marquez IV, despite the ending. 2 exceptionally skilled elites going to war. Tons of drama and high level violence.
Already mentioned, but Pacquiao-Marquez IV is probably 'the correct answer'. Although I'm not his biggest fan, Joshua's fights with Ruiz (I) and Wlad were great, knockdowns for both fighters, exciting KOs but no-one too badly hurt, sensible post fight interviews, etc.
Cant pick 1 (Im sorry) Srisaket Sor Rungvisai vs Roman Gonzalez (1) Inoue vs Donaire Froch vs Groves (1)
AJ vs Wlad for me, one of the most iconic and entertaining HW fights of all time. Honourable mention to Pacquiao vs Marquez and Inoue Vs Donaire.
From a personal pov as a Scotsman, probably Taylor vs Prograis. HVery high-quality, with adjustments ebb & flow and great action with neither fighter giving any quarter. From a more objective point of view I'd probably have to go with Froch vs Kessler I That had everything, watched it since a few times, what a tear-up!
Yup that one was amazing. I think Miura could have maybe even survived Vargas onslaught and come back again but he had taken so much punishment already and his neck/head twitches were concerning to say the least