Street Fighter Alpha 3 is considered by the majority to be the pinnacle of the series, and is very often called the best Street Fighter game in existence. It certainly is the most popular, having been ported to four consoles and two handhelds since the days of the Saturn, and is usually the recipient of the highest scores among Capcom fighters.
My own obsessive collecting of 2d fighters over the last five years can be directly attributed to the day a good friend of mine brought it over for an afternoon. It was the first time I had sat down with a 2d fighter since the old days when I rented Super Street Fighter 2 on the SNES once a month. Things had certainly changed since then. The super combos, the beautiful sprites, the multitude of backgrounds… Alpha 3 showed me that the genre still had a lot to offer. → There is only one really serious philosophical problem, and that is games.