So from what i have now learnt, basically all pools are equally profitable. The only things that change are the distance between payouts, pool fees and difficult changes.

On a mining calculator, its suggest that you would get around 0.06086BTC per week, or 0.2608BTC per month (about 4 times previous). Its like me giving you £1 per day or £30 at the end of the month that is all.

Now if the pool has fees, you could expect it to drop around 2% or more, but with ckpool, there are none

Its also based on luck, we might find a larger block or smaller block so that could also effect your return by maybe 5-10%.

The only other factor is difficulty, if we don't find a block between the difficulty changes then it could get harder for us if it increases, or easier if it decreases.

Let's say that a block seems to be found here every month, you'll expect around 0.2608BTC, which would be more than most other pools due to their fees.

Hope that helps