Ok. It took a good, long time, but I have finally stopped debating. With only 19 days before the release of Halo 5 (yes, I have been counting) I chose which controller to purchase. Now, I don't deny that it took me a long time and it was very difficult, they were both so cool. But in the end the sexy silver and blue of the Spartan Locke themed controller had the final say. So that's the one I'll be going with.
Thanks to all those people who voted for Spartan Locke's controller in my little poll, your advice was well recieved. Thanks also to those who voted for Master Chief's controller, your advice was well ignored. And thanks to 343 Industries for being awesome (and taking my money).