PoorBoys Black Hole is a glaze, so if you just apply it and no sealant / wax on top, it probably won't past a wash or two. It's good stuff to use before waxing / sealing.
Autoglym UHD has great gloss on dark colours and lasts around 3 months in my experience. I've also got Soft99 Fusso, which has great longevity (6-12 mths) and looks good, but not quite as good as UHD. If you don't want to wax regularly worth considering Fusso or a ceramic coat.
Forensic Detailing on YouTube for good product tests. If you want to properly geek out on this stuff Pro Detailer Magazine is worth a look.