Just make one of each. Loot is easy enough to get now for each one. Try them out and see which ones you like. And I don't mean complete the Earth story missions then decide. I mean max out all of your subclasses and get in-depth experience with them so you don't just whine about something you clearly have no real experience with. It gets old seeing people making two of one class or even three, then asking people if it's worth making a different class. Or when people don't like the way another class plays against them, but don't understand how that enemy functions.
For those of you who don't have all three classes [u]and[/u] understand your foe. Kudos
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Two hunters and a titan