Pool Solar heating- To do all the heavy work to heat your pool
Heat Pump- To top up your pool temperature from a higher base
If you are thinking of the ultimate long term heating solution, that will not only save you money over time, but give you the widest swimming season out of all pool heating options.
Example - September 28 degree target:
Ambient pool temp 14
Solar heating with thermal blanket 22 degrees (Weather dependant)
Heat pump would only need to heat the pool6 degrees
This means your appliances will work less and be more efficient over time. A heat pump alone will struggle to keep your pool up to temp and cost valuable $$. Money that would be better spent elsewhere.