There is no definitive answer to this question as both pronghorn and cheetahs are incredibly fast animals. However, some reports indicate that pronghorn may be slightly faster than cheetahs in short bursts of speed. Studies have shown that pronghorn can reach speeds of up to 88 kilometers per hour, while cheetahs have been clocked at around 80 kilometers per hour. So while there is no clear winner, it seems that pronghorn may have a slight edge when it comes to speed.