Both are excellent machines, and have their share of support from end users.
The Graphtec has more internal options for cutter settings as well as many more blades available than the Roland. The thing is your average user doesn't need them, so if you are comparing the two machines against each other with basic usage in mind then its a toss up as both machines do the basics very well.
I feel that the Roland is a little easier to navigate through the control panel and change its settings. I'm also a fan of the packaged program for the Roland, Cut Studio over Graphtec's packaged program Robo Master Pro.
Graphtec's packaged cutter interface is second to none however. The cutter interface will come up anytime you send a job to the cutter, and offer you all sorts of options from media positioning, to changing cutter settings such as force and speed.
Make sure you pick a company to purchase from that gives good support and offers a good price and I'm sure you will be happy.