Absolute Classics from B/X and 1e for me!
A series Slavers(specifically A1 & 2)
B2 Keep
B4 Lost City
C1 Hidden Shrine
C2 Ghost Tower
GDQ Giants, Drow, Queen
EX1 & 2 Alice (Probably just me!)
I1 Dwellers
I3 Pharaoh (I4, 5 are fine)
I6 Ravenloft
N2 ... HA! Just kidding. N1, Cult.
S1-S4 All of them.
T1 on it own. Or all of Elemental Evil.
U1 on its own. Or all of U1-3.
X1, 2, 4, 5. Expert series had a great run.
and ...
WG4- Classic Tharizdun!