The Kodak Professional C41 films continue to be superb. And I like using the Kodak Gold films as well.
I never liked particularly the Fuji slide materials, preferring instead the recent Ektachromes (which I still have in reasonable quantity).
I'm hoping that the new Ektachrome that has been promised will be of similar quality, and particularly hope that it will be made available in 120 as well.
Kodachrome was a wonderful film in its time, but the last Ektachromes were better.
EDIT: and if black and white is on topic here in the color forum

, the new T-Max 400 is the best black and white film I've ever used.
I do miss Plus-X, but if the supply/backing paper problems with T-Max 100 in 120 don't get resolved, I'll be happy to transition to FP4+.
Printing the newer black and white films is a revelation if you compare it to printing an older film like 1970s era Tri-X.