Hi there Karey, and welcome to our little corner of the world.
I have done both flex and core rather casually. Some of these other ladies have had tremendous success on Core! I have had greater success on Core than on Flex, simply because of what you are saying--I can eat whenever I want/need to! It makes a big difference. I am not so consumed with counting points or measuring portions, but rather just eat when I'm hungry and not worry about it. If being hungry is a big issue for you, I would probably recommend core. But then again, I'm biased!