For me, the 2.5mm is the way to go. Just a bit off the corners.
A man of culture I see
I have the 2.5mm and it does great. It didn't even look bad for 1/2" counters...it's just the right size.
Also - my handle broke some time ago and some very helpful grog shared a video of how to fix it...a small drill, some epoxy and a screw and BAM! It's working again.