Can you tell me please, why can be better using p2pool, and why not? I mean pros and contras, can you?
The main advantage is just that it's basically the default configuration of p2pool. You have access to the performance graphs to let you see exactly what the pool is doing.
p2pool also has the advantage that people are donating to the TRC pool, which has the effect of increasing payouts. The biggest disadvantage of p2pool is that payouts are skewed to miners who have been contributing for longer than about 12 hours. Your payout will build up over time and stabilize after about 24 hours.
This is an experiment for me. I'll leave it up for the next few months at least. Terracoin is still young enough that the payouts are big.
If you want a more traditional pool, use bitcoinreactor. I've talked to the owner and he knows what he's doing.