Is it better to be in IB over ISC if I want to do my undergrad in UK or US?

Hello - I was wondering if I should do IB instead of ISC if I want to study in the US or UK? Does it help my chances?

IB provides a great standard to compare students to between countries and schools, and US and UK Universities alike are intimately familiar with it.
ISC may not be quite as well known, but I doubt you’d be at a disadvantage as long as you are ranked highly among your peers. They’d likely look at class rank more than pure scoring in this case.