Company 1, option 1.
This is the old standard way of doing things. Pump and tank will last an average of 7 years worth of cycling on and off. Irrigation zones must all be 25 GPM, no smaller and no hose irrigation to keep the pump from cycling itself to death sooner. Pressure will always fluctuate between 40 to 60 PSI while using water in the house, which is annoying and keeps things like instant water heaters from working properly.
I assume you mean “VFD” type pump, which means it is variable speed. My opinion of these is that the installer just hasn’t been using them long enough to know that are not long lasting or reliable. If the installer has been using them longer, then they know they make a lot more profit off you, which doesn’t speak to the integrity of the company.
Just less water volume than option 1.
Company 2, option 1.
1.5 HP, 25 GPM pump should never be installed with only a 20 gallon tank! Doesn’t sound like an “upgrade” to go with a smaller ¾ or 1 HP pump?
Again VFD pump system means the installer is not very experienced or ethical.
Neither SS or PVC will rust, so they both last a long time. Don’t want to go with small diameter of either.
10 to 15 GPM is all that is needed for the house. Any flow rate higher than that is determined by the size of irrigation zones needed.
Depends on what the pumping level is. If the casing is large enough to use a flow inducer or shroud, the pump can be set at the bottom of the well. This is the best way to make sure you are getting the most you can from your well, especially during times of drought. Many people have to deepen the pump during hard times. If the pump is already at the bottom you wouldn’t have that concern.
Since neither company mentioned a Cycle Stop Valve I assume they are both extremely far behind the technology available to them, or neither really wants your pump system to last a long time and be trouble free. Time for a quote from Company 3 and 4. Find a company that uses CSV’s and you will have found a reputable one to work with.
Do a search for a CU301 on this site. The CU301 is just one of the VFD type controllers. You don’t want to be like the many people who got stuck with one of these and is now asking questions on how to get out of a bad situation.