Vuze is safe to use as long as you download it from the official site. The best alternative is qBittorrent, which is both free and Open Source. There are more than 50 alternatives to Vuze for a variety of platforms, including Windows, Linux, Mac, Android and BSD. Be sure to review the policies of the individual site. There’s content available legally via the bittorrent protocol (from Vuze, the site and the application, and from other sites and applications), but that’s still not yet true of everything that’s available.
uTorrent is really small with low memory used and is lightweight and it uses very little CPU and RAM.
Although it’s said that Vuze is faster than uTorrent but practically it’s seen that uTorrent is faster than Vuze. UTorrent is available for many operating systems like macOS and Android.