Most of my effort goes into long-term trend-following trades off D1 charts, so my focus is quite broad across the 28 main pairs.
That said, some offer better prospects than others even when in an equally valid trend. So I rank the pairs according to long-term volatility, margin requirements, spread, recent price % movement and how many weekly bars are currently overlapping.
Some pairs with highly correlated currencies are always low volatility - e.g. AUD/NZD, EUR/CHF, USD/CAD. trends can be consistent but expect price to take longer to move anywhere.
Pairs featuring AUD and NZD have wide spreads and heavy margin requirements.
Each weekend I update the price changes in the last month and in the last 3 months for each pair. I put a warning flag against the bottom 7 or so.
I also look over the weekly bar overlaps in the last 3mths. Right now for example AUD/CHF's weekly bar overlaps with the prior 12. Its going nowhere fast. Anything with 5 overlapping bars or more gets a warning flag.
The pairs with the best trends plus least warning flags get traded urgently.