For cordless vacumm chat. I have the Vax Blade 2 Max. 40 beefy volty bois. I don't think suction on a handheld is ever going to be as strong as corded, but the 40v makes the powered brush head actually pretty terrifying. I have intrusive images of losing a toe. I've still kept the upright (also a Vax, hence getting the same brand for cordless so the accessories all interchange) for mega cleans.
If I was replacing it, I would probably go with their new "ONEPWR" range as that has replaceable batteries. The Blade 2 Max has about enough juice to properly clean my 2 bed flat on the "boost" power setting. Although, it's not amazing on hard floors, tbh. If you use it with the brush spinning, it can sometimes just chuck bits away from the sucky up area. It does have a neat mount/hanger that allows me to store it in a nook out of the way, next to a socket.