I wouldn't say a ball the swings and seam more is a better ball. I would say swing and seam should come down to the skill of the bowler..
Here in Aus 99% of all cricket played from juniors right up to first class and test we all use Kookaburra balls... From what I gather from posts on here every team seems to use a different ball... Why is that? Why isn't it uniform where all teams must use the same ball?
still comes down to 'skill' (or action that's probably random more than skill
) to bowl swing/seam. However, I completely agree with you that's it's a good thing to use the same ball for all games. That is something I wish would happen in this country. I sure Dukes could produce a few million more balls and keep the costs down if they wanted too. (plus it would stop leagues using some really shockingly bad balls!)
The main nation I'm surprised doesn't choose Dukes is SA. I can understand India (apparently someone is cleverer than I am and says it's SG that provide Indias ball), Pak and SL using Kook as they like batting so would choose the batter friendly ball. NZ is basically just Australia (sorry Kiwi's
) and Kooks are an Aussie company so Aus will have to use them.