I use a simple way of comparing ball performance. I divide the cost per ball by the total number of dots of all performance specs. This give you a credit cost per 1 dot of performance. so for the Platinum vs Truvis I get the following:
lvl 90 platinum 650 / 3 = 216.67credits per ball. Total dots of Performance: 16.5
Ball cost / Total dots of P : 216.67 / 16.5 = 13.13 credits per dot of P
lv 67 Turvis 625 / 3 = 208.33 credits per ball Total dots of Performance: 14.0
Ball cost / Total dots of P : 208.33 / 14.0 = 14.88 credits per dot of P
This works if you value all performance factors equally, obviously. But it's a simple way to compare ball cost to performance.
I do use it when comparing different Nike balls with the same durability, as a way to compare performance. Just my 2 cents worth.
phred952