Would you be willing to answer a few brief questions about PlayStation Forums?
-Level 2 has small range of explosive.
-Level 3: With this SuperAttacks it is difficult to kill more than three enemies.
parappa's level 3 super.
with his level 2 super I almost always get 3 kills. there really seems no reason at all to go for his 3e. and even if you get just 2 kills, you can still be quick enough to go for a second time.
The developers themselves rarely use level threes. they use one's and twos basd on charecter. Example: a charecter like kratos is worth going for 3 for.