Outer Limits 4x4 Board

Have GQ 4.2 turbo glide diesel its got the big donoldson barrel air cleaner. I have a GQ primary cleaner box and was wondering if I should fit that or go for the smaller GU unit, have heard they are better for some reason, buggered if I know why can anyone help
johno

Only 4.8 air cleaner would be better because its alot bigger. I've got a 80 series air box in my gu ute. Alot cheaper to buy. Paper filters are alot better then oil filters. Used to have a uni filter it didn't work that well. Real pain to clean