What film is a question now that many film photographers will argue over.
For colour I tend to shoot Fuji, with Velvia on large format being one of my favourites but tricky to use due to high contrast.
For Black & White i have generally stuck with Ilford and HP5+ rated at 400 ISO and have never used Kodak Tri X which many rave over.
So I have placed an order and got a pack of Tri X to have a go at. It might be sometime before I show any of my work with it as my film use is only occasional but I look forward to giving it a go.