Although similar tactics-wise, being the person above will give you a slight advantage. Why?
 
1. You can shoot rockets at the floor, rather than having to guess at the wall. Shooting floor allows the blast to be closer to the enemy, making it easier to hit him, as well as inflicting more damage.
 


Shoot the Floor!



 
2. You can bounce the grenades down while being against the back wall, which will effectively keep you away from enemy fire (if he's shooting rockets), while still being able to inflict damage on him.
 


Keep on Bouncing!



 
3. You have the advantage of being able to drop down and finish him off, or run away. If he's hurt, you can drop down at any time and cut him off. He won't know where you're dropping down from, so you have the advantage. Additionally, if he does manage to hurt you, you can run to the GL area and pick up the health packs, or pick up the RA if it reappeared.

Next: Lightning Gun Tips