I'm still doing A Levels and I'd say that personally I think my university experience will be easier because right now I'm doing 4 subjects (one of them being art, which I want to carry on with). The only subject I enjoy is art and I'm struggling more with my other subjects, especially since I have to do exams for them. This isn't really about the actual difficulty of what I'm learning compared to what the university level would be, more like doing 4 subjects and not enjoying it vs doing a degree of something I really enjoy
I'm second year biological sciences, and it is definitely much harder than a levels. At a level there wasn't much coursework, so most of the time the work was just preparing for exams. and for the exams we just had to learn what was in the textbook. And we got loads of help with the coursework. Now there is loads of coursework, with little help, and there is loads to learn for the exams and you need to do extra reading for the exams.
I guess the difficulty will vary depending on the course and uni, but surely any degree that is easier than a levels is a waste of time.