The Triplet would clearly be the clear winner overall as it has a more focused fire than the sprayer (It says it in the name)
Here are the Pros and Cons for each tank:
Triplet the triplet has a lower Damage and Penetration than the sprayer but there is always going to be more contact than the sprayer, this could equal it out if it is a week player and doesn't know the game very well.
Sprayer the sprayer has a higher Damage and Penetration than the triplet. this can come in handy if the triplet is moving around a fair bit or in retreat back to it's home base. If you had the triplet in a corner than you would have the advantage.