My first reaction was the rounded nose, but as I looked at the images longer, the pointed nose is etching away at me.
Really, I am with
Daryk insofar as the functionality wins out for me on this one. I believe the German aircraft had more utility, especially at the outset.
According this website:
"Although the Alpha Jet came in different variants, here is a tip on recognizing the two main types of this successful fighter jet. Alpha Jets with a rounded nose were used for training purposes. Indeed, a round nose delivers enhanced stability during the flight stage, an advantageous benefit for training pilots. Conversely, a sharp nose is the distinguishing feature of the attack version of this aircraft."
In the meantime, have an Alpha Jet with delusions of being a Big Cat:
And this...this is a beautiful aircraft. I shall be stealing this scheme.