If you were the captain of your team, what type of ball would you advice to your bowler.

….and yeah, who would that bowler be (some captains may prefer a spinner thats why)
good idea Monti, but the bowler has to be totally focussed in order to avoid that bouncer being called a “wide”

Chosen Answer:

A bouncer

In that kind of a situation,the batsmen expect the bowler to bowl a yorker or a low full toss so they are prepared to face that kind of a delivery.
If a bouncer is bowled,i think the probability of the batsman scoring a 4 will be low.

I also liked the answer by Gladiator,a slow off or leg cutter outside off stump would also be a good option.You have to bowl something which the batsman is not expecting.

Edit-
A wide ball will not hurt much.You still need 3 to win and the batsman will strill have to look for a boundary.
I can’t think of many batsmen who can execute a hook shot properly and that too under pressure and that too while thinking that the bowler would bowl a slow ball or a yorker.