It seems to me like your original question was “Big #'s (strength), or six pack” not “Big muscles, or six pack” yet many people have attempted to answer the latter question.
If in fact you meant to ask the second question, then I think many people have already intelligently answered it.
If you actually meant the first question, then I don’t see why you can’t have both. One of the strongest people I know is about 5’ 9" 145lbs and can press a 230 lb person over his head like it’s nothing. He can also physically overpower most guys who outweigh him by 100 lbs.
He is also incredibly powerful and unbelievably strong for his size. On top of all that he is shredded. Not just abs, but everywhere.
So, while I realize that there is a correlation between a muscle’s cross sectional area and it’s ability to generate force, the relationship between the two is not a linear one. There are a lot of big guys who really aren’t that strong and can’t put up all that impressive numbers, then again there are those who can.
There are also a lot of small guys who can’t put up all that impressive numbers and aren’t that strong, then again there are those who are.
Look at gymnasts, breakdancers, cirque de soliel performers and olympic lifters such as Naim Suleymanoglu “The Pocket Hercules” (who by the way holds the world record for the clean and jerk and snatch). All of these athletes have very low bodyfat, but also have great muscular development and are incredibly strong.