Its no different from do you buy Heinz baked beans or Tesco own brand....little difference except big difference in price.
Sorry, cannot agree there. Has to be Heinz. Which is a shame as I have a cupboard load of Branston beans that I got from cash and carry, but wish I hadn't after eating some
Actually i dont eat baked beans so maybe a poor comparison... 
A tesco value banana tastes just the same as a waitrose banana but....im sure you get the point.. 
I think there's a lot of hype and snobbishness regards tyres.
Quite possibly. But I've yet to find a tyre that comes close to the SP9000 on the MV6 (actually, thats a lie, the Conti SC2 comes close).
Don't for a second think that even the best budget tyre performs as well as the top end of the (decent) premium brands.
But in many cases,
decent budget tyres are good enough. But know the limitation of the tyres you have - for eg, I know my Nexens on the tractor have very poor grip in very wet weather (water streaming off the road). I haven't found a weakness in the SP9000s yet, despite using them for a few years.