The 11652x Daytona generation came in 2000 with a so called “old buckle” or “short buckle”. In around 2007-2008, the M series, came the change from the “short buckle” to the “long buckle”. Some prefer the “short buckle” for its aesthetics and uniqueness while some prefer the new for its functionality.
The “short buckle” is unique as it has more curves than the new one. It was also used only by the Daytona from 2000-2008. It is shorter and the clasp is smaller. Operating it may not be as easy as the “long buckle”, but it is absolutely more attractive in terms of aesthetics. It looks weaker than the “long buckle” while having a shape that displays more curves.
The “long buckle”, on the other hand, is way more substantial. It is more hefty and substantial. Operating it is also easier as it is longer and the clasp is bigger. However, it is less unique as the GMT Master II also uses the same buckle. The shape of it contains less curves and looks stronger.
I personally prefer the “short buckle” as the shape of it is way more unique. Although it may not be as good as the “long buckle’ while operating, it fits the image of the Daytona more as a sporty elegant watch.