I'm biased since I ride celeste. I say oltre. its just sex on wheels in the flesh.

but seriously, it would depend on what kind of riding/racing you intend to do. I don't have experience with the venge, but I think if you're a muscle-car crit racing kind of guy you'd want that. the oltre is more of a grand tour do-it-all bike.

I think the oltre is abit classier too, but thats entirely subjective

all the bullcrap aside, if you are tossing up between two frames choose the size that fits you best

the bianchi comes 50 53 55 57 59 61
venge comes in even sizes 49 (i know not even) 52 54 56 58 62

spending this kind of money i hope you go to a proper shop and get proper advise in regards to the size, no matter how fancy or light a bike is its only as good as it fits !

now go ride them !!