Sunshine is King, use the shorter cable but if a longer cable is needed for sun then use it. You can even try both cables in series. Wiring loss will limit the charging.
FYI Unfortunately the controller at the panel results is the most inefficient charging due to it’s output voltage drop to the battery. As an example the typical panel voltage will be 18V+. Better to have the long cable wiring loss to the controller input with the controller output voltage at 14.8V for a discharged battery and short cables to the battery vs a lower charging voltage at the battery.
