Best choice between OpenType - PS and OpenType - TT?

Question

I have learned in this community, that OpenType PS, is NOT actually the old postscript file. However, I have fonts that include both OpenType - PS and OpenType - TT. Which is the best format to use, and why do some fonts include both? I prefer to delete the ones I don't use so there is no confusion later on. Thanks.

Bobby Henderson · Answer

TrueType Fonts have curves built using quadratic splines. Postscript fonts can use cubic splines, which allows fewer anchor points on the letter paths. It's sort of a Coke vs Pepsi thing really. Postscript-based outlines can be more efficient in terms of a file size footprint since the glyphs have fewer anchor points. But quadratic curves are easier/faster for a computer to render on screen since the computational math involved is far less complex.

Font files don't take up much disc space. If a type family comes in multiple formats I'll just keep the different format font files in separate folders.

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