As an owner of purebred cane corsos, if you were to buy either of these pups and the parents are registered with the AKC, then the litter should also be, and you'll get a puppy oack so you can register. In that pack is the family tree of the sire and dam, with their registration numbers, and it goes back several generations. So... if the breeder can't/ won't provide you with this information up front, find another breeder.
Additionally, if I remember correctly, having the saddle coloring is a disqualification. So, if he will answer your questions and you decide pob that pup, you won't be able to show or breed it (even if you weren't initially planning to). Because it's not show quality, you shouldn't pay show quality price. Reputable breeders know which pups are show quality and which aren't, and they are priced accordingly.
Corsos do have the same health concerns as other mastiff breeds, so make sure that the pups have gone through all of their health screenings. And make sure you can visit the kennel, and set how they were raised. Corsos need socialization from DAY 1, so a breeder who is very hands on with the pups is important!
Cane Corsos are not for 1st time owners, but since you've had Shepards, you have experience. Just know that the Corso is like other mastiffs but more so, if that makes sense. I grew up with Great Danes, and Corsos are a whole new level! I wouldn't trade them for the world, but they need consistent training and socialization from the start, as well as a strong alpha.
Make sure whichever pup you pick has the right personality to fit with your family and lifestyle.
If I may add my personal two cents: please leave the ears natural. It still conforms, and they are so much sweeter looking and more approachable that way. Additionally, with natural ears they are far less likely to be mistaken for a pitbull. There are thousands of amazing pitties out there, but since some states still ban them, naturally ears help with any potential confusion.
Do note: the Corso's bite strength is 3x that of a German Shepherd, stronger than an African Lion, and equal to that of a leopard or jaguar! So... socialization from the beginning is key! And I don't play tug-of-war with Corsos! Before they're a year old they can beat you, and you need to remain the alpha!
Anyway, sorry for my long post... I love my corsos, and wouldn't trade these sweet Italian pups for anything! They are huge cuddle monkeys and want to just hang with the family once they outgrow the puppy crazies. I hope you find the one of your dreams!