I'm not going to say one is better than the other, but the Graphtec is a workhorse, too, and will last you many, many years.
We went with a Graphtec and we didn't look back.
You'll find more support here for the Roland, and that might be important to you, especially if you haven't used a plotter before.
In this case, just because something is cheaper (less expensive) it doesn't mean that it's lower quality.
As a side note, we find the stand that came with our cutter to be EXTREMELY useful as we're in a small apartment with almost no surfaces. It's also good to have it for rolls of vinyl.
I don't know if the Roland has anywhere to put your vinyl rolls or if you just put them on your table, but if that's the case, you'll be chasing wild rolls all the time and you'll need to get good at re-rolling vinyl.
