Joanna,
MathType has had decades to refine how they programmatically present their math content, and use math fonts explicitly designed for that purpose. The very first equation editor available in MS Word was created by the originators of MathType.
In Apple's Pages, Numbers, and Keynote — one may enter [La]Tex, or MathML equation syntax with the equation editor, but these applications are not using [La]TeX to image that equation. Each application has a third-party helper application (blahtex) that translates a limited scope of either markup language into the embedded document equation. In short, with [La]TeX (e.g. MacTeX 2019) you have the ability to customize exactly how that \sqrt content appears, but with blahTex, you do not.
Optional reading about [La]TeX/MathML equation support in Pages, Numbers, and Keynote.