Canisters vacuums normally have stronger suction than upright vacuums. Canisters can fill a dual role of a full-sized upright and a smaller machine (like a stick or handheld vac) for smaller jobs. Also the compact nature of these machines allows cleaning under furniture (usually a problem area for uprights).
The Stinger 2 Wet/Dry Vacuum apparently “sucks” — in this case, it’s a good attribute — it performs well and is inexpensively priced at $27. Here’s what a reviewer said at Cool Tools: I tried a hand-held dustbuster type, but found that its incredibly small storage and lack of any useful way to hold debris […]