Out of the two posted, I'd have to say I'd be tempted with The Exterminator. I'm just worried about it's lack of long range weapons. (And I'd also be tempted to remove the med pulse for a normal med laser,. Maybe use that tonnage saved for more SSRM ammo? Don't know... Maybe just shift the med pulse into the CT instead?)
However,
my AL runs slightly differently...
The ERPPC is primarily to be used for range, very sparingly up close.
The dual med laser and twin SSRM system (with BAP) are for close up fights and annoying fast mechs.
This helps keep your running cool with the ERPPC and you can be useful if the match ends up being a long range snipe war. Also, if the PPC arm gets blown off, it may hurt, but you still have plenty of fight left in you. (As you normally lose the arm in close range engagements, you probably no longer need it anyway.)
Just some food for thought, though it looks like a lot of other people have already posted their own builds...