both cars are good cars and 100,000km i think is only about 80,000 miles. it depends on if your buying it for the economy of the car or the performance of the car if your going for economy i would pick the integra but if your going for performance then theres alot of choices one is what engines are in the cars if the prelude has the h22 then you have a good start over the integra because it has 200hp compared to a regular integra with only 100-130hp if your looking at an integra gsr then you have alot more performance products available and a bigger aftermarket following with the integra but if its just off of both regular cars i would go with the prelude. another big thing to look at is who had the cars first and how well were they took care of. i hope i was some help.