It really depends what part of the world you're from
If you are in the UK, Fitch is definitely the superior substrate, but if you're in the US, Kaytee clean and cozy would be your best option! There are several different aspects you'll want to keep in mind when choosing which bedding that suits you, such as
-isn't dusty
-eco friendly
-safe
-Comfortable
-economical
-absorbent
-odor control
-burrowability
There are lots of options available so make sure to find what suits you and your hamster best!