What are the pros / cons of using 1/2 inch compared to 3/4 inch poly pipe ?

I want to add 4 coils, each 300ft of pipe.

My feed from the pump / filter is a 2 inch pipe ( and so is the return pipe back to the pool ), and I plan to add 4 T-pieces to that line ( 1 T for each coil )

I just can't figure out which diameter pipe to use.

My logic tells me that :

1. using a set outer diameter for the total coil (4ft), will result in the same area of pipe in the coil being exposed to sunlight.

2. the larger diameter pipe will put less back pressure on the pump.

3. the larger diameter pipe ( x 4 coils ) will have a better flow rate than the thinner pipe, thereby giving better thermal transfer to the water.

I want to add 4 coils, each 300ft of pipe.

My feed from the pump / filter is a 2 inch pipe ( and so is the return pipe back to the pool ), and I plan to add 4 T-pieces to that line ( 1 T for each coil )

I just can't figure out which diameter pipe to use.

My logic tells me that :

1. using a set outer diameter for the total coil (4ft), will result in the same area of pipe in the coil being exposed to sunlight.

2. the larger diameter pipe will put less back pressure on the pump.

3. the larger diameter pipe ( x 4 coils ) will have a better flow rate than the thinner pipe, thereby giving better thermal transfer to the water.

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