Both are good choices...
To be honest, each has its own benefits and downfalls. CJ & Performics are both fantastic choices (I'm a bit partial to CJ as the interface is a bit more user-friendly).
I have seen affiliate programs succeed in both arenas... but aside from network, the most important thing is the quality of affiliates you bring on-board with your program. Most Super Affiliates work across the networks, so you should have the same "potential" in either network... it's just a matter of recruitment and retention.
Service-wise... again, both have their peaks and pitfalls... just like anything else. As an agency, we have had great experiences with both. But I've heard some grumbles from those who deal on the merchant-level in regards to customer service as well.
Good luck!
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