[M.B.E.]

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You use the stop n go, when the other player will call your preflop push no matter what and you have a small/medium pocket pair.

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Stop n go works better when you have broadway cards. Makes it more likely your opponent will fold the better hand on the flop (e.g. opponent probably folds 66 on a J-8-3 flop) but if he does call you still have outs.

If you try stop n go when you have a small/medium pocket pair then opponent will play close to FTOP-perfect. E.g. suppose you have 77 and stop-n-go your opponent who has AQ. If the flop comes small cards then you want your opponent to call your flop allin but he usually won't. If he does flop the ace or queen then he'll call and you're drawing very slim.