The 180sx shape has been in production from 89-99. That’s ten years without a major facelift. It’s testament to the 180’s classic good looks and performance pedigree. Not many other Japanese cars have such a long production run (300zx & Supra).
Compared to Skylines the 32, 33 and most probably the 34, will only be in production for less than half the time. Why does Nissan have to keep changing the Skyline line up? The 180sx was and still is a great package that has not needed to be changed.
If your comparing the rb25 to the sr20 the fact that you see so many heavily worked sr20s in Japan reaffirms that it’s a better engine. However, if exhaust note is what your after then yeah rb’s rock. Japanese tuners don’t touch the rb25 cause it’s an inferior engine, and also because they can use the rb26. There is no doubt that a GTR engine is better than the sr20 for power but not everyone can be rich enough to own one!
Skylines and 180s both great cars but id take a stock 180 over a stock skyline !