avast is a bit more strickt in its PUP detection… it will for eksempel class many factory installed programs from hp / Dell / Thosiba as PUP because of what they can do…programs that can be good or bad if abused
so when using avast PUP scan you need to know what it is before you remove it, and i Guess that is why it is default off in quick/full scan
i recomend you stay With default avast settings and run a weekly quick scan With avast and Malwarebytes, remeber to update MBAM before you scan as they can have 10 updates released a day