I guess the 5GPM would be for a slow recovery well?
No. It would be for a well where water is farther down. It would have more stages, and would cost more than the 12 GPM pump.
85 feet to the pump, 75 vertical feet(300 lineal) to the house.
The horizontal matters very little. The 75 feet is important, and that will add to the depth of the water in the well.
Regarding selecting a pump, I would think a 7 to 10 gallon pump would be good for most houses. Neither of the ones that you listed are in that range. One thing to consider is that your pressure tank should be big enough to let the pump run for a minute or more. If pumping 15 GPM, you would want at least 15 gallons of drawdown, and that would be about a 60 gallon pressure tank.
It may be that a 1/2 HP pump would be a better choice.
See the graph, which is for some 7 GPM pumps. This is for Franklin J-class, but other makers and models will have similar graphs. The vertical axis is feet of "head". That is the sum of the pressure in the house translated to ft + the actual distance down to the water surface + an amount to allow for the water surface dropping (20 ft may be a good number).
You want a pump that will spend most of its time in the shaded efficient area, and ideally near the middle of the shade. You want a pump that stay on the solid part of the line for its design. Something to consider is that the pump is not pumping into the highest pressure most of the time.
There are similar graphs, and tables that can be easier once you have selected the HP and GPM for most people, for other pumps. This graph was snipped from
http://franklinwater.com/media/146690/mj3200_jclass_3200_series_brochure_06-15_web.pdf I am not saying that is the pump family you should use, but other pumps have similar curves.
If you have two good choices, smaller HP is better. You did not mention whether you are using a "2 wire" or "3 wire" (3-wire needs controller) pump. If you have higher water requirements, move up to 10 GPM. 12 would be high for most houses I think.
