I myself have the Razer Blackwidow Ultimate 2014 Stealth (was able to get it at $99 while on sale at NCIX US). My friend has the regular one with the green switch, and says they are almost exactly like the Cherry MX Blue in his old keyboard.
From experience, I will say that oil from hands shows up bad on the Blackwidow Ultimate and needs to be cleaned regularly if you have sweaty hands, to keep it looking nice.
G710 comes with a palm rest, and media keys. (If these are an important feature to you.)
Neither keyboard comes with a key cap puller.
I don't want to sway your decision either way, both are great keyboards by great companies.