Oasis \ Blur
I prefer Blur but it’s hard to argue against the absolutely domination Oasis had in Europe for the majority of the decade.
yeah I'm definitely team Blur, but Oasis had a bigger impact at the time. and a lot of the Oasis vs Blur was defined by their roots working class verses art school, which is less important here than in the UK.
i want to add Ash \ Supergrass but neither of them rose to the level those two were. Belle & Sebastian arrived a little late to rule the 90s.