As someone who is well-acquainted with both SMath and Mathcad, I am often asked which package is better.
I respond with a question to a question, something like this – which is better, an airplane or a helicopter? Both of these machines are designed to transport people and goods through the air and each has its advantages and disadvantages.
SMath and Mathcad are intended for calculations using units of measurement and the familiar notation of formulas.
About the advantages of SMath on the Mathcad forum
https://community.ptc.com/t5/Mathcad/Mathcad-vs-SMath/m-p/802499
Let's write together about the advantages of Mathcad on our forum!

1. Mathcad has Minimize/maximize functions

2. Mathcad can solve not only ODEs but also DAEs systems