Thanks guys, found alot of info branching off of your answers.
Running XT just keeps you on the largest blockchain. It is the same bitcoins and the same network. Bitcoin XT is just a replacement client of Bitcoin core that allows larger blocks.
did i get this right or no?
You're close, but not quite right.
XT is the same bitcoins and the same network. It
*might* allow larger blocks in the future if enough people indicate support of it. If XT never gains much share of the network, then it won't ever allow larger blocks (unless Bitcoin Core also chooses to allow larger block some day).
XT also implements a few other changes that Bitcoin Core doesn't. I'm not certain, but I believe it forwards unconfirmed double-spend transactions (which Bitcoin Core does not do). There may be a few other changes as well.