Quoted from Mad_Dog_Coin_Op:
Yeah the CLA 45 and GLA 45 are same power plant but the CLA has a slight edge 0-60 do to less weight. They both have a top speed of 168 mph. To be honest, the GLA is way more fun to drive with the suspension tweaks. The Alfa numbers are funny to me because they seem to change all the time. I’ve rather have the 375 hp and space to stretch my legs. Besides, the Alpha C4 dies on the vine around 130 mph
Top speed on the c4 is 160 mph, so I hadn't heard anything about dying at 130. The c4 is a track monster, less an acceleration or top speed king. I drive the Alfa Quadrifoglio which is both an acceleration and top speed killer, and it handles quite adeptly. But I have an acquaintance that owns both and prefers the c4 over the quad for track duty.
At the end of the day, they're all awesome and I would gladly drive any of them. I especially appreciate the uniqueness of yours. I can't stand driving something everyone else drives.