Not much advice, it's a personal thing. I'm not a fan of Roccats. They have plenty of detractors and followers. I eyed the Xai previously and went for the Qpad 5K which I like very much. I would take the Xai over the Deathadder at that price.
Xai / Qpad / deathadder are on the light side and have no weights. There is an army of logitechs, Coolermaster sentinel, ect... A lot of it is down to preference.