way more stressful and attention demanding, micro heavy in beginning with all the manual reclaiming and raiding/reacting to, and having to memorize and flawlessly execute build orders for all the maps or lose before it even started
teamgames provide stability for game to get played to its fuller potential unless you are a pro that can do all of this solo while having fun doing it, it kind of seems you need to have "minimum mastery over the game" to be able to enjoy 1v1, and it seems pretty high
or maybe I'm just bad at the game, that's more likely it