When you're comparing two things, you use a coparative adjective like this:

She's taller than he is.

I'm more scared now than I was the first time.

If you want to describe the amount of difference between two things, you can use the phrase "quite a bit":

She's quite a bit taller than he is.

I'm quite a bit more scared now than I was the first time.

"Quite a bit" is something in between "a little" and "a lot".