Exactly what the title says, what should I get???

Is there more space in a sedan (say commodore size) or a smallish SUV (like a subaru forrester size?).
DH suggested a commodore wagon but I sat in one and being a shorty I found that I couldn't really see out the back very well. I didn't feel very comfortable in it.

Oh and we have 2 kids in car seats and want a decent boot for going away etc. Any suggestions appreciated please!!!