This has just been published:
https://www.mdpi.com/2311-5521/5/4/236/htm
It's probably the best comparison of flows / pressures / drag / lift on hatchbacks / /notchbacks / fastbacks that I've seen.
Warning: the pdf download is a large file, but the paper can be viewed in web browser too.
Lots of pretty pictures for people who don't want to read a lot of text.
In order from lowest to highest:
Drag: Fastback, notchback, squareback
Lift: Fastback, notchback, squareback
There's a lot in this paper that contradicts what has been said here over the last decade.