In our last build we installed a 20kw propane with automatic switches. Nice to have as were living on an island that had at times outages that ran for more than a few days. (250 year round homes). This unit ran around $15K by the time of purchase, wiring it up. Since then we have resided for the last 7yrs at our present home-and have had to use a generator once. It's only a 5000 watt with a 7500watt surge start up. The meter base has the link up to plug into so it's fairly easy.
I looked into getting a stand alone unit as the island had: 20KW, LPG, auto switch. Propane is easy as there's no fuss/mess/old fuel....but here's a kicker-weekly test/runs 20/30 minutes...outside auto switch...trenching for power/propane lines....costs are similar as the island set up...except it didn't include trenching.
So I have opted for a used diesel 12KW generator $3K that will trailer mounted 100FT 6/4 cabtire power cord. The trailer will be fully insulated and I can tow behind truck/tractors to move it from my shop to the house if needed. By the time it's all done it will be a $4K investment that will run the shop-then when needed the house/garage/barn.
The house is fully renovated with a LPG boiler, hydronic heating system, and as of today we have still 40% of the home's heating system not turned on yet. We have a 3 head split air unit that handles the main living areas, and is used for air conditioning/heating on the shoulder seasons.
The big events effect everyone-ice storms-the grid goes down, weather related events. Hydro One has done a great job in the tree trimming over the years, and it shows when we have high wind events and there's no outages.
It comes down to peace of mind and where one places the value. We have friends that live on the island-home worth close to $2mil. yet they don't have a back up system for the power outages that occur. Closets are full of endless fashion though...