rustup is still the recommended way to install.

Rust has a 6 week release cadence, and while the language has settled down significantly over the last 1-2 years, there are still a lot of new features arriving that library maintainers are eager to use. Combined with performance improvements, you will almost always want to use a recent compiler.

Relatively slow moving package repositories are not a great fit for that reason. Rustup also handles installing support for various architectures - which are often not packaged well - and fast-moving tools like rust-analyzer.

The nightly situation has gotten much, much better though. Almost non of the popular crates still require nightly, and staying on stable is just fine for most projects.