Should I prepare my taxes with software or go to an H&R Block store?

I've just separated from the Army where they do your taxes for you which means that I don't have a clue how to do it on my own. I am married, have a child, do not own a home but I do have investments. I know that I'll have a large refund (child tax credit, earned income credit etc...) because soldiers don't make a lot of money. I am quite computer literate. My question is, how easy is the H&R Block software to use and does it do a good job of finding everything we are entitled to? Is an H&R Block office better than the software and worth the higher cost? Lastly, how much (ballpark) does the office cost? They aren't giving me a clear idea. I'm not considering a CPA due to cost and simplicity of my tax situation.