GM 2.8 V6 vs 2.0 4 banger,witch one is more reliable ??

[Alain Toussaint]

having received a call from my cousin who found a good car for sale (i'm
in search of one) not too expensive (i plan to take some holiday time in
vancouver in july),he found a old's ciera 83 having'bout 225 000 KM ( 140
000 milles,yes the car has lot o'milleage but then,i've got not much money
to spend on it,but at last,i'm not going to vancouver with him),but now,i
have a problem arging with mom's chum,he states that the car fuel milleage
is very low (in the V8 teritory) and the engine is a lot less reliable
than his 4 banger ( cavalier and sunbird 2.0L ),i want to set the record
straight,does the cavalier 4 banger is more reliable than the oldsmobile
2.8 V6 ?????

thanks a lot.
Alain