dual core or a quad core? HELP ME

Deus Gladiorum

Distinguished
That's not the question you should be asking. You should be asking "Which CPU model should I get?" I would say get a quad core, but I might be doing you a disservice if that quad core was an FX-4300 and that dual core was an i3-4310, because, believe it or not, the i3-4310 wins out by a rather huge margin most of the time. Here's what you should list:

- What's your budget?
- Are you buying a motherboard with it or do you currently have a motherboard -- in which case, modern CPUs only work in certain motherboards.

In this day and age, you can't tell which CPU is better just by looking at core count and clock speed. There's a lot of other factors you need to consider when it comes to performance.