Hmmm.. I would say ACCT1151. I actually did better in ECON1203 by a few marks, but I still think 1151 is heaps easier, especially since I did the 1203 course in Sem 1 last year, just before they changed it and made it even harder. I love maths and found some of the 1203 stuff challenging to fully understand.
If you did really well in ACCT1501, you can basically do just as well in 1151. I do have a feeling they might have brought down the final marks though, because I went in the exam with 40/40 and didn't do as well as I hoped with the overall subject mark, but still HD.