The upper one is a Hoover PowerMax.
The circled red one in my photo on the right is an entry level Hoover Futura with manual wrap storage. That power head would not have a headlight and have a single row bristle agitator. The one in that photo is missing another wand which makes it look very short. It would have two wands. Third photo uploaded. I think the model number is S3561 but I'm not definite on that.
The second one circle on the left circled in green in my first photo is a Hoover PowerMax S3603-040. It was circa 1994. That PowerMax had brush roll on/ off, cord rewind, covered tool storage. See second uploaded photo. ***The hose on my unit shown was replaced with a black hose and better material. The original hose for it would have been beige with beige gas pump handle like my later photos and a much more rigid hose material that kinked heavily.
There were many PowerMax canisters over the years but that one was just called PowerMax.
I've had both of those models over time.
I added more photos too, all of which are my machine. I sold the Futura to another collector and no longer have it. I still have my PowerMax and it will never leave my collection. It is a childhood model of mine.
Also, there was another PowerMax with same color and same feature level but different logos during the earlier period when Hoover used numbers instead of adjectives for their naming schema.
In the early 90s Hoover named various machines from a number such as the Hoover Legacy 810 upright or Spectrum 900 canister, Elite 350 upright, etc. In the mid 90s, they eliminated the numbers and used adjectives: Supreme, Plus, Ultra, Deluxe, etc.
