I put diapers in 2 categories: (1) Night time diapers which are also good for outings and (2) hanging out at the house diapers.
I will spend more money on category one because sleep is invaluable and also not having blowouts when you are out running errands or at a friends house.
Category 2 diapers are mid grade and do the job but won't work for overnight or trips around town.
Pampers = Category 1 (the most reliable diaper)
Kirkland, Huggies and Up and Up = Category 2 reliable but not quite premium quality.