What’s the best sleepsacks for baby??

Which sleep sacks did you like? I’m looking at the halo ones but I see a bunch of brands. Also I figure sleeping will be different with a newborn versus six-month-old etc, so were there ones you preferred at different ages?

I’m trying to figure out what to get. I know they say not to use a blanket till at least one or even two years of age so I figured I would just get a bunch of sleep sacks that were the right sizes. And not to sound stupid but did you put your baby in a onesie and then inside the sleep sack? First timer here 😆