Well, unless you have a Mac. Apple AAC is still the best quality encoder, but it's only available for macOS, and even then, the only UI officially supported by Apple is the "Music" app, so you're going to have to use a third-party command line or GUI wrapper. (XLD is good.)
Outside of that, quality of the various alternatives has changed over the years, but the Fraunhofer encoder, which they say they are using, is a good choice, even through licensing problems mean that it isn't included in ffmpeg by default. Frustratingly, the default build does come with an encoder called "aac", which isn't Fraunhofer, and has very poor quality. So, you have to make your own custom build.
Even then, the low-pass cutoff defaults to a weirdly low value, leaving the user to guess at, or consult ancient wikis, to try to divine a suitable value.[1]
It's unfortunate that AAC remains the best (by which I mean, most-supported) choice for modern lossy audio, because making it is still a huge pain.
[1]: https://wiki.hydrogenaud.io/index.php?title=Fraunhofer_FDK_A...