My fourth baby and I'm still using the flat prefolds
I've never been interested in trying anything else because the prefolds work so well also with my first two children I went with a diaper service which was very nice especially with how often newborns use diapers it was a big relief not to have to wash my own I was too exhausted to do anything
The diaper combination I'm using this time are Dandelion brand organic cotton prefolds with the Prorap classic diaper cover and the Snappi brand diaper clips I got them all on Amazon
I use gDiapers stuffed with prefolds from Green Mountain Diapers. They work great, they're slim and have a great fit, they hold in every mess, and they're SO cute. Easy wash routine, elastics don't wear out, and no PUL to delaminate. Plus they have a great resale value so when we're ready to go from one size to the next it's fairly easy to sell the smaller ones or just swap for larger sizes.
I've gone with tots bots, a combo of easyfits and bamboozles after my sister trial and error-ed a few different brands.