It depends on your goals, and what your life outsider poker looks like. If your goal is to play poker for profit, then I think, the best development plan is to get practice with both cash games and SnGs, but not at the same time. Take 3-6 month, where you grind cash games, and then 3-6 month grinding SnGs. And then maybe after that move to MTTs, if you have time for them. However even if your goal is to play for profit, it will not work out well, unless you enjoy, what you are doing. So to some extend each of us need to follow our heart and play the games, which we enjoy most. So if for instance someone really hate cash games, then dont force yourself to play them.
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