For a beginner i would recommend SNG "Double or Nothing", cause in those games you don't really need much poker skills to get cashed. You just need to be very tight and patient. If you are, many of those games you will win even if you are totally card dead, especially on a micro limits, where people are just too impatient and dropping out pretty quickly. Also look around for a good freerolls as well. And then when you built up your bankroll a little bit and gained some experience, you could have try cheap MTTs if you have time or standard SNGs if less time. But as a beginner, don't even look at cash games tab. It isn't exist for you.
I am agreed with akmost, why choosing one if can play both? I am personally also a SNG reg, but if i have time and see a good freeroll or if i smell for overlay at some affordable MTT, i gonna play it too. I know that MTTs can be pretty long-lasting and even boring after some time, but hey, they are giving still the best ROI of all kind poker tournaments if you get to FT.
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