Black and Decker - dustbuster® PIVOT VAC™ Cordless Handheld Vacuum

If you have power tools and are already invested in a battery system then buy a handheld vacuum from that brand. I own Ryobi tools and batteries so I got a Ryobi vacuum and it's so much better than the Black and Decker dust buster that I had before. You can even attach accessories to it. The batteries last a lot longer but more importantly the filter doesn't clog up a minute into the job. The problem is that these batteries are made for heavy duty tools so they're expensive so wait for deals. I think Ryobi Days on Home Depot starts soon.

I don't know if it's the "best" but we have a Black and Decker handheld that runs off their interchangeable 20v batteries which has made it pretty good in terms of futureproofing. They have a larger stick vacuum that works on the same batteries, along with their tools so we have like a half dozen batteries that work across all these things.