Are these useful or actually just noise? Which one can help predict, or are they good at being lagging indicators?
Honestly, the simplest method of getting in and out of a trend trade (a trade that lasts a few months) is simply plotting a line that shows the uptend support and the downtrend resistance.
Look at BTC in this example, simply following the trend lines and exiting when they are broken from an uptrend and entering again when they cross through downtrend resistance, you save yourself stress and capture most of the major move.
The biggest limitation in the market is yourself, your greed and your patience. Follow the simplest rules and stick to them. Be happy with smaller gains that are consistent and stop trying to buy perfectly at the bottom and perfectly at the top.
TL:DR - Trade with the trend, just plot simple upward support and downward resistance lines. Buy and sell when these are broken.