Should I place my preamble on a .tex file or on a .sty file

I’m writing my thesis and have decided to place my preamble with packages and custom new commands and macros in there in order to have a cleaner main.tex file.

I have placed my preamble in a file named mypreamble.sty.

Is this best practice to write a .sty?

It compiles as expected and no errors are shown.

Should I place my preamble on a preamble.tex and call it with input{preamble.tex}?

Here’s a minimal working example:

usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage[brazil]{babel}
usepackage{titlesec}

titleformat{chapter}[hang]
{normalfontbfserieslarge}
{thechapter}
{0.5em}
{MakeUppercase}
[]
titlespacing{chapter}{0em}{*2}{*2}[0em]
.
.
.

And on my main.tex I simply call it with

documentclass[a4paper,12pt, article]{memoir}
usepackage{mypreamble}
begin{document}
My thesis.
end{document}