From what I hear..the rear strut brace makes a more noticable difference but I have neither so don't judge based on my opinion but that is what I have read consistantly on this forum.

98 Silver Frost Contour SE Sport ATX
BAT Handling Kit, SVT E1 Wheels, SVT TB, UIM, Airbox , SVT Exhaust, Rear Strut Brace, Pioneer Deck and 12 disc changer, Pioneer 6X8's