I have both but have quit using the large Generacl/transfer switch. The system I am using and have installed now for a few others is a very quiet Honda EU 3000 gas generator. I have back cord wired into a manual safety switch with about 6 circuits plus two dedicated 110 circuits run directly off the generator.
This powers all the lights (LED), kitchen, furnace, 2to3 frdges, computers, TVs,. It will 24hrs on a tank and is so quiet we can run it all night.
Cord can stay plugged in. When power is restored, flip the safety switch and turn off the generator or vice versa.
Way cheaper and quieter than the propane generator.