You're better off with mesh-style square holes. Round holes just add more restriction from sand being able to go through.
Here's a pix of the kind I use. In the first 15 seconds, you'll see the square holes. Only the duck-bill part has the "holes". Since , of course, that's the part that has to strike the ground.
https://www.youtube.com/watch?v=SY0hgdwcD9A
Stainless steel is the best, if you are going to be @ wet salt. So that your baskets don't turn into a rusty mess after a year or two (nor require constant fresh water rinse at the end of each use). If you are hunting fresh water lakes, then perhaps you don't need stainless steel.