pros and cons is usually used to describe how desirable the attributes of the Object or effects of an action ( buying a big house) are, usually projected in future.
Pros: Big house will allow kids to have separate rooms etc.
Cons: The air-conditioning bill will be higher, etc.
for and against is usually used for counting support by people or institutions.
The Husband was for buying a big house
The Wife was against buying the big house.
If you said "We discussed all the points for and against buying a big house", that is accepted usage. So I am coming around to thinking, if you can count things to tally, it's for-against, if not, it's pros/cons.