Get a canister with bags, bagless vacuums spread fine dust everywhere because their cheap undersized filters leak. From previous research the eureka mighty mite is the most recommended cheap vacuum on reddit if you’re in North America. If you have wall to wall carpet you may want something more powerful, but you at least will want a turbo brush head (where the vacuum power runs the brush head instead of a separate motor). If you only have hard floors the standard heads are fine.

I went the bifl route and ended up with a Henry due to it’s modular repairable/rugged design and good air filtration system.