You don't get what you pay for. You do get a feeling of luxury and nicer packaging.
The things that actually work are Nivea Soft (the white tub) as excellent moisturiser, using SPF year round to prevent wrinkles, and using potions containing retinol once you decide you have signs of aging you want to combat - look carefully at the label for %age retinol as it's not the case that the higher the price the higher the %age.
You're bound to get on it's sone brands better than others, texture, how it feels on your skin, whether it makes you shiny, the small, the packaging, the dream....
For make up, it's worth getting the more expensive brands for eyeshadow and lipstick, as there is more pigment so it performs better. But lip glosses and blusher (and anything else more sheer) is just as good in the cheap ranges. Mascara can be a bit variable.
I really like Superdrug's own brands (couple of quid an item for loads of stuff), also Bourjois and No7 (mid price). I've never gone high end, except a red Chanel lipstick as a treat, and an amazing pinkish one from Dior I wore on my wedding day