Firstly I’m a bit of a novice when it comes to comparing tyres, I just started a few weeks ago having ridden same brand for 3yrs.
That being said I’m finding the cheap Nobby’s better than the expensive Fat Alberts. The cheaper tyres are a little heavier and thicker but I’m finding them more grippy and to me that’s the most important thing. I’d say the more expensive Nobby’s will be better (eg lighter) than the cheaper ones but to me that’s secondary as to whether you like the tread/grip/rolling resistance etc. FYI I’ve ben riding High Rollers but I wanted a more all round and xc capable tyre.