RE7 VR. It will forever be my first full game experience in VR providing 60 hours of unforgettable game play. It has left as much of an impressions as half-life in '98 and one of the very few games I have enjoyed enough to finish on the highest difficulty level, twice.
Anyway VR is on a different level. For pancake games the competition is quite close. TLG, SotC remake, GoW, BotW, HZD, GTS, U4 all play and look amazing. If I go by most played it would have to be GTS, sitting at 1435 hours played. For single player BotW wins with 170 hours.