You're a wise man Davcon and i think that my cabinet can very well accommodate either of these heat sinks. All i am worried about is performance.
as far as performance goes both are really good. as davcon said RAM could possibly be a problem with chunky heatsinks but if you think you can fit it you would know better than me :P
The tuniq cooler has a bit more features but the Hyper 212 is a very well proven choice also. I don't think you would be unsatisfied with either and you should pick the one based on what you like, because neither is better than the other in this case.