Spiral vs Straight Bits

This is the verdict: straight cutting edges are good only for stirring coffee.

Read more about the superiority of angled or spiral cutting edge profiles over straight profiles.

This is an explanation why you want to use nothing other than a spiral upcut bit when cutting out patterns (such as electrical boxes, windows, or various apertures through sheet material.

Note that guide bearings allow you to not destroy the material below in case of underside templates (ex. window cutouts). For overlaid templates, you can achieve this with Router Bushings. bushings - but the same can be achieved with router bushinggs when wor.

https://kmtools.com/blogs/news/spiral-router-bits#:~:text=The%20big%20difference%20between%20straight,more%20material%20with%20each%20rotation.