Either of these is very tasty & hot. Adjust the amount to match the heat you are comfortable with.
I have found these only in ethnic Chinese markets. There is normally no English on the containers (or the shelf), and you have to judge by looking through the glass at the product whether it is what you want (unless, of course, you can read Chinese). On the jar of Jiaxiangyoulazi at the right, I think the penultimate character is the one for la 'hot/spicy'. The last character is just a filler syllable.