Go for the diversity and do not limit yourself to one or two classes. If you want to experience all of what destiny has to offer, you need to be all three classes and have all nine subclasses available. Missing out on any one will deprive you of your full experience regardless of what class or subclass you are skipping out on. We all need our Hunter to do some insanely fun and idiotic things, our Titans to be the methodical champion or overconfident and lovable airbag, and the Warlock to simply deny logic and do things you simply have no time to explain... until you need to explain how you messed up. Each class has it's highs and lows and if you do not have a class you will miss out on both.