Can't really say which you should buy, but I figured I'd give you my experience with the G10.
It works really well, but it might be a pain to set up with its pump and fan headers and lack of VRM cooling and kind of bad instructions.
Depending on your case, you can have all that heat pushed right out with a decent static pressure fan on low and you'll have a lot less noise compared to a R9 290 with XFX DD setup (90c+ with max case fans, GPU fans, just could not manage the heat) and decent temps or a bit of noise and very good cooling. You'll want to add this kit to get proper VRM cooling. RAM seems to be okay without heatsinks, but you might want to add that too. I spent about $200 total to cool an R9 290x and 290 with G10s, H55s and two VRM kits. So, if you do one, ~$100.
Gelid VRM cooling kit:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835426042
All that said, you could take the shroud off and ghetto mod with zip ties and a spare fan.