Funny to post this since Maradona never scored in a final too (and reached two less than Messi).
Since you hold goals in finals in high regard here is another fact for you:
In his WHOLE professional career (club+NT), Maradona scored only ONE major final goal: a penalty vs Stuttgart in 1989 UEFA Cup final. Counting minor competitions, Maradona scored two goals in two-legged Copa de la Liga, a Spanish incarnation of a "League Cup" that lasted for only 4 years before being cancelled.
Counting all finals they played, their goal count is:
Messi: 20
Maradona: 3
Haha, excellent point.