Well.. in my experience.. AEG have always been a top of the line brand and Electrolux has always stood by that, even back in the day in the early 1990s, an AEG vacuum cleaner carried the famous "Made in Germany," moniker as a way to exude and promise extra built in quality. In some ways the Excellio carries this, even though it is an Electrolux vacuum.
Generally then for floorcare ranges from Electrolux, the umbrella companies share:
AEG - top of the line
Electrolux - Top & Middle of the line
Boss - The old offshoot name for budget vacuums.
Husqvarna & Flymo only had specialist vacuums in the 1980s and they didn't stay around for long, perhaps Electrolux's way of testing the UK market.
Now it looks like this:
AEG - Top of the line
Electrolux - Middle and bottom (as they still sell the Powerlite bagged upright "seasonally.")
Zanussi - The replacement for "Boss" budget vacuums.
John Lewis - Exclusive department store appliances for the large appliance market; the previous "HiLight bagged upright," was also sold under John Lewis, but JL already have a deal with Bosch to supply bagged cylinder vacuums.
I had the original Electrolux Ergorapido stick vac when it was first sold in the UK. When Electrolux went into promotion overdrive for AEG, it donated the next model replacement to AEG as well as the current Ultra series, again no doubt to promote the "Made in Germany," aspirations, even if the machines are either made in China or Hungary...
It is a terrible mess, really when you look at it. When you can see what Electrolux used to have in their floorcare ranges, its a smack in the mouth to the loyalists of the brand.
I also grew up with a few Tricity appliances but only when they were under the old Thorn EMI ownership company who also had Kenwood. Tricity fridges and some cookers also carried the electricity showroom brand "Electra." For Bendix, the home company was Kelvinator from Italy.
We had a replacement "stop gap" Bendix washer when our Hoover Electron 1300 called it a day and after the Bendix washer dryer returned to the Hoover brand for the Ecologic 1300 washer dryer - much better quality and general performance aside from expensive drive belt replacements in later years.