I'm sure it's been done quite a lot before but I really wanted to add my perspective.
Most people say a degree is harder. But if that is the case, then why do most the population taking A-Levels fail to get AAA and above while at university, there is a far higher % that get a 2.1/1st.
If you were to consider A-Levels looking back, they would obviously seem easier as you've already done them and they should therefore look relatively easier. So I think it's important to consider the difficulty of both while you are/were actually taking them.
For me, I honestly think A-Levels were probably harder (I did get AAA so it's not because I was **** at my A-Levels)
Why? Because in my opinion, they required a higher level of critical thinking. At university, it's all about rote learning problem sheets and praying for the best as learning 10 different 300-400 page books for each module is just silly.
A-Level exams covered less content but it felt like the work was covered in greater depth. There was loads of variations that would arise in exams, along with variations that had not shown up in the past. I think it's key to note here I still remember most my A-Level Econ/Maths while I cannot remember much of some of my modules in uni last year so A-Levels clearly taught content better.
In terms of workload, I guess a degree could be harder but it's a non-issue for me as I never attended classes at school nor do I attend lectures/seminars at uni. My workload in both scenarios pretty much consists of no work all year then turtle mode 2-3 weeks prior to my exams.
I think it's also important to consider university. I'm pretty sure a degree from Warwick is not the same as a degree from Coventry in terms of difficulty. Otherwise, How would students who were getting BBB- at A-Levels suddenly be acing university exams and getting firsts?
I think the issue of varying difficulty of degrees probably makes it hard to come to any solid conclusion.