i had this debate for months when i was aware my yokos were on their way out.
basically i couldnt afford another set of 4 yokos to go on my polished wheels, and a local garage was doing a good offer on maxxis tyres.
in my opinion, i cant tell the difference at all, in the wet, in the dry, when driven hard. if i wasnt told i would think i never changed the wheels and tyres! i would also add, maxxis arnt a "cheap/no name" brand either, they are very good tyres.
the only thing i havnt tried yet is driving it in snow, but it was rubbish with the yokos on in the snow, i would think it still will be.