Pairs move in different ways at different times but some characteristics are so long-term as to be almost permanent.
Each weekend I check the long-term volatility of the main pairs, plus their price move in the last 3mths, the last 1mth, and how many consecutive recent weekly bars overlap. Low volatility and weaker recent price movements make these poor opportunities. On this basis I am currently avoiding -
AUD/NZD
EUR/CAD
EUR/JPY
GBP/CHF
Also offering poor scope are -
AUD/CAD
AUD/CHF
CAD/JPY
EUR/GBP
GBP/AUD
GBP/NZD
Worth noting also the AUD and NZD pairs have wide spreads + heavier margin requirements.