Should I buy a new car or a used car? Budget wise, a used car is definitely better, but I'm worried about the conditions or underlying problems it might have. Any advice?

Your concerns are valid. And old cars need more maintenance and this can cause more inconvenience.

My dad chose to buy a new Kia car a couple of years ago. He says it's more affordable while offering nice features (e.g. sensors).

I have not purchased a car before, so I don't know much beyond ^