No contest, Barney Miller

Indeed Barney (I havent ever heard of the other one -- AH MAN!!)

Barney Miller

Seasons/Episodes:

Barney Miller - 8/170
Brooklyn 99 - 8/153

Nielsen rankings:

Barney Miller (1975-82) - 68, 37, 17, 17, 15, 20, 34, 54
Brooklyn 99 (2013-21) - 98, 113, 118, 137, 161, 138, 105, ?

Emmy Awards:

Barney Miller - 3 (Comedy series, writing, directing)
Brooklyn 99 - 2 (Stunts)

Actors appearing in both shows:

David Paymer
K Callan
John O'Leary (also appeared in Car 54, Where Are You?)