The difference between Alliance, DUP, Sinn Fein, UUP, SDLP, TUV, the Green Party and People Before Profit
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Check this out.
Remember this is a FPTP election so you get one "X" and the most votes wins. That means tactical voting comes into play. For example, I would be more aligned with the Green Party politically however they haven't a hope in hell of winning in my constituency (North Down) which is a two horse race between Alliance and an Independent Unionist.
I will vote Alliance as they are the candidate I want as my MP rather than the other front runner.
Does that make sense?
Our assembly elections are PR so your vote goes further and you can safely vote for smaller parties.