When we take a look on the momentum indicators, we can't say one is better or worse. They are similar but complement each other, so the search for the best divergence indicator isn't very profitable in my eyes. Better you learn to use your tools purposeful. Do not set high periods for your divergence indicators. Why? We can compare the behavior of traders at given points. I don't care whether an oscillator is in an OB/OS zone or none-trade-zone (I mean what should this be?), just use the divergences. At the beginning of a trend the momentum is very often higher, more and more trendies realize that the old trend is over and switch into the new direction. At the end of a trend, more and more traders go out having reached their goals or loosing their trust in the trend, so the momentum go back but some laggards (often already in a loosing position) don't accept that the fight is already lost and try a last big outbreak but they don't get support anymore and also momentum don't react much anymore.
As I or many others repeat over and over again, one indicator is useless, but a bunch of approaches with synergy will change it in your favor. When more and more signs of weakness/strength appear at the same point or at a strong S/R zone the possibility that the market will turn not only for a retracement are very likely. An emerging divergence against the trend (unconfirmed divergence) and the lack of other signs for retracement/reversal is a sign that the market stops shortly but there will be an impulse further in trend direction because traders have confidence in the trend what is a good sign for a healthy trend.
Have fun and don't forget that trading is an art, not science.
