I think this depends largly on the year and modle between the two. A civic Si with a b16 stock, is gonna be faster then the integra ls with the b18 non vtec. On the same lines an Integra 97-01 gsr ( I think) Had the b18 c1 while earlier GSRs ( i think first gens) had b17s. Also, you should take into consideration your personal preferences, the civic has extremly different styling from the integra, and yet another factor is whats available in the area? If you could snatch up a 92 civic hatch back with a GSR swap and limited miles, for around 5k Or you can get that GSR motor in a integra for 8-18k. Your question is really to broad to give you an answer thats based on anything more then opinion. That being said, get a Del Sol and never look back