Biggest issue with Cane Corso is consistency and breed-type variation; they are very inconsistent, and whereas there's at least two clear types in Presa's (/ Dogos), you have Traditional Cane Corso and the two psuedo types Euro-Corso (heavy Neo, Boxer, AmStaff) and US-Corso (Neo, Rott and AmStaff/Pit).
When you get a good one, they are very good dogs. They are taller and often times bigger than many Presa's in overall weight (usually detrimental) but are longer legged and narrower, as they are supposed to be a coursing mastiff first and foremost, they are not primarilly a catch (butcher's) dog. The good ones I've seen tend to be better disposed toward strangers as adults than good Presa's, and not nearly as dog aggressive, though I read a lot of posts this year on a couple of non-UK (Auustralian and US) forums saying they are very dog aggressive in some folks experience so hard to say. When they work, what I've seen's been very good, more than enough for real-life, but, they do tend to lack some depth that the better Presa's have in high-stress training situations and can 'evaporate' quite quickly. They can have a very, very hard grip too.
Both breeds are good, to decide what you like / suits you, you need to find the lines of both you like, then go see them in the flesh.