HNC or FoundationWatch
(this is what I did - completed my HNC part time between 2017-19, if you have any additional questions)
HNC/HND are practical, vocational courses and very much orientated towards the needs of the UK job market.
What Level 3 (A levels etc) have you done, grade expectations etc, and what subject degree do you eventually want to do?
I'm not sure about the costs for international students, but generally HNCs are cheaper (mine was £3800 compared to the £6000 of a foundation year at the time). But they are much more of a vocational course that complements your job, as opposed to direct entry onto a degree course.
A foundation year takes 1 year but costs a lot more and uses up 1 year of your uk visa allowance.
An HNC takes up 1 year, costs a lot more, uses up 1 year of your visa allowance and can cause problems with progression rules if you then request another visa restarting in yr 1 of a degree.
This really isn’t complicated.
What degree subject do you want to study?