If you want to know what is a well build, long lasting vacuum, go into a repair shop, look at what models are waiting to be repaired and buy something else.
When we started a cleaning service 30 years ago, the only vacuum that stood out was Kirby for the suction and build. They lasted decades.
After a shoulder injury I had to find a power drive for the up to 10,000 feet I would do a day. The best was the Hoover Concept. Tons of suction and the best pet hair removal. I can still get them rebuilt.
The best canister was the Dirt Devil Pro series. All metal, dual motors/ fans plus electric power head. So much suction that the hose could be put on the back and used as a leaf blower.
Now we use Hoover wind tunnel power drives. Great suction plus a hose and tools including a air power furniture head. We replace the first set after 10 years with the only repairs being belts and beater brushes.
Someone mentioned a older vac that would suck the carpet off the floor, that would be a Eureka convertible. It could pull the carpet off the tack strip.
In a canister the commercial back pack is king but a bit bulky in a house.
As for the rest, we have tried most testing for the company or using customers vac. Most work meh ok. The trailer is so small that a Dirt Devil hand vac does it all in minutes.