Community Colleges often have more resources in terms of assisting people in catching up academically. Additionally they are much more cost effective and its easier to be enrolled in such an institution part time than other places. Nowadays they often have general education courses online which can help as well.
My personal opinion is that regardless of where you graduate from, its important to make sure you can get good recommendations from at least some of your professors/ school related employees. That way, you show graduate schools that you have a work ethic/ potential.