MACD cross over generally lags. meaning for a bullish corss over to occur, the market has to have hit a bottom already and generally should be in a short term up trend. So given that, although you would miss out on some of the 'meat' from the bottoms, with cross over, you are conservatively betting bullish based on an estabilished and strong ST trend.
Given that this is on a weekly chart, it is probably more reliable since it tends to be smoother and therefore, less chance of a head fake.
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