Diesel or gasoline?

Evening, I might like to buy a C70 for the summer. The question is only if it is to become the 5 cylinder gasoline with 220 hp or the 5 cylinder diesel with 179 hp. Which engine is stronger and is better suited for overtaking maneuvers. Drive in summer about 12,000km only long distance (Friday 230km, Sunday 230km over land and AB). Speed is on the AB at approx. 110-130 km/h. Greeting MondiGhiaX