Kenmore 600 vs 700 vs Meili?

Hi all, we currently have a Dyson stick vacuum and it gets clogged quickly with dog hair.

We have solid floors with area rugs. Doing some reading, the Kenmore 600 seems to be well thought of and in the $250-$300 budget.

I'm seeing a Kenmore 600, a 700 series for about the same price. Also a Pop-N-Go also for $300 and then just came across a Meili C1 Turbo for around the same $250-$300.

Are all these about the same? Coin flip? Best place to buy from? Any retailer that has good open boxes specials on these? I thought shopping for a Kenmore 600 would be simple but there seems to be a lot of variables.