CSS @font-face scr: Should format('woff2') or format('truetype')

[ben700]

I know you're going to close but how else can I ask a developer, and this will come on the 1st page of Google for others with the same question!

I'm hardware limited and need every last cycle, ++C not C++ style what format should I use when using a

What format do you guide me towards if I was say following all Google HTML/CSS Style Guide, plus all other Google Guides from GCP, HTML, Android, Chrome, Mest, Pixel Pixelbook; like all current builds end to end;

format('woff2') or format('truetype') ?