A high wattage (input power) doesn't always mean better suction because the amount of this power that's turned into air watts (suction or output power) depends to some extent on the vacuum's design and efficiency.
The capacity of the vacuum cleaner's dust bin or bag will essentially determine how often you'll need to empty it. If you have a large house and you don't want to be going back and forth the bin, it's worth investing in a vacuum cleaner with a bigger capacity. That said, if you have trouble lifting or manoeuvring a vacuum cleaner, bear in mind that the bigger the vacuum cleaner's capacity, the heavier it'll be.
The history of vacuum cleaners in the UK dates back to the early 1900s. Hubert Cecil Booth started the first vacuum cleaner company in the UK, known as the British Vacuum Cleaner Company. It wasn't long however before William Henry Hoover, who had already experienced success with his vacuum cleaners in America, made headway in the vacuum cleaners market in the UK and overtook Booth.