1. The learning materials are much better. The official Rust book is excellent. And it doesn't take long to do a first run through it.

2. You'll learn much quicker with Rust. With C++ it could take you years of experience to gain a full appreciation of the pitfalls because they're often not apparent when you first write the code, only when you actually run into the bug further down the line. With Rust, you'll get a compile error and enlightenment is quick google and a reading of a blog post away.

3. Some parts of Rust only seems to be difficult for C/C++ programmers who have learnt the C(++) way of doing things and expect that to translate into Rust. They get frustrated when Rust doesn't let you use certain patterns. However as C++ is generally less strict, if you learn the Rust way first, then you'll generally be able to translate that fairly directly into C++.