Stay safe. Stream legally.
TL;DR: Neither site is "good," but if you are purely comparing file size, download speed, and library depth, 9xMovies often edges out 300mbMovies4u for quality-to-size ratio, while 300mbMovies4u wins for pure archive depth of older Hollywood films. However, using either carries severe legal and cybersecurity risks. 300mbmovies4u 9xmovies better
While 9xMovies offers higher quality video and a deeper Bollywood library, and 300mbMovies4u offers slightly safer ad navigation, both platforms are ticking time bombs for your device and your ISP records. Stay safe