as someone who maintains projects both using just and make, I have to say just is awesome, and allows things like writing a given task directly in a scripting language. sadly its not universally available across operating systems and linux distros (ubuntu/debian was the last significant dev ecosystem where it wasn't native, re apt install). so for projects with wider contributor goals, I still default to make, despite its warts (which are many imo), cause it tends to work ootb.
