scooby burble is due to unequal length exhaust manifold headers ( 2 on the passenger side are longer by 2x the length ( about 300mm )
the subaru for me is the better car for money and price/availabilty of parts
also better in sti form ver 3 or above only though
standard wrx's are not worth the money really ( cheap thrills ) very soft bearings as standard
age wise the subaru sti up to version 5 ( my99/00 ) is better looking than evo 1 to 4 versions ) but anything above an evo5 i believe i would take over the subaru anyday
in comparrison though i think the ayc is what makes the evo ''an evo'' lol sublime handling and unlike the impreza is sturdy ''ish'' when hitting the edinburgh cobbles lol as for the impreza in this regard it feels really like the door cards and windows etc are going to either fall off or crack
overall i would choose an sti version 3 to 5 over an evo 1 to 4
anything newer than a my00 ( 2000 ) impreza and an evo 5 would be difficult to chose but going more with my head than my heart i think the evo is king for evo5 onwards