With Litecoin mining, a significant part of the yield comes from Dogecoin - provided the pool runs merged mining and pays out both coins. This is exactly what you should check first when choosing a pool: how are the DOGE earnings paid, are further merge-mined networks paid out, and in what form does payout happen? A pool that looks cheap on paper but lacks clean merged-mining compensation ends up being the more expensive one.
Otherwise, the usual criteria apply: consider fee and payout model together, choose a minimum payout that fits your number of devices, and prefer a stratum server close to you. The basics are covered on the overview page Mining Pools. Switching pools is possible at any time within minutes; customers who have their devices hosted by Cryptohall24 choose the pool themselves, freely.
How much yield remains after the pool fee at your electricity price - including the DOGE share - can be calculated in the Litecoin Mining Calculator. The development of the Scrypt network is shown on the Litecoin Network Hashrate page.