'Much' or 'a lot' can be used to show that there is a big difference between two people or things.
'A little' or 'a bit' can be used to show a small difference.
With adjectives :

Austrians are much more formal than Swedes, and they are much less direct.
Austria is a bit cheaper than Sweden.

Remember that we cannot use a double comparative.

Right : Austrian food is much heavier.
Wrong : Austrian food is much more heavier.

With adverbs :

She speaks a little more quietly than I do.
He drives a lot faster than I do.

With nouns :
If the noun is uncountable, we use 'much' or 'a lot' (for a big difference), and 'a little' or 'a bit' (for a small difference).

In Sweden, they eat a lot more fish. They have much less daylight in winter.

If the noun is countable, we use 'many' or 'a lot' (for a big difference), and 'a few' (for a small difference).

There are many more jobs in Sweden.
There are a few more taxis in New York than London.

Use 'fewer' to compare countable nouns and 'less' to compare uncoutable nouns.

There are many fewer hours of daylight in Swedish winter.
In Sweden, they have much less daylight in winter.