surge chaser app

Which is more important in planning future hunts, from week to week, at a fishing-hole checkpoint in Surge Chaser: The maximum surge value or the average (--which is always lower)? Or should I pay the most attention to the Surge Analysis report, instead?

Which is more important in planning future hunts at a fishing-hole checkpoint: The maximum surge value or the average (which is always lower) ?

I see it charges for "premium" accounts. Is there a basic account that is free? What features does the basic account have