With a pool that size, That's an awful lot of water to try to heat. especialy considering that water will cool over night.
We have an 18 foot diameter above ground pool that is currently hovering between 18 & 20 degrees cel. just from the sun and ambient temps. I highly doubt either of these heaters will give you more than a 2 degree increase.
I know every little bit helps, but might be a waste of your dough.
......a short term solution is pee.
....
