I think the difficulty of a course depends not on the curriculum but on the hard work and dedication of the students. If you’re studying hard and are following the right learning techniques, even the toughest of exams will look easier for you. But if haven’t prepared well and are not studying properly, the easiest of exams would look complex to you.
So it really depends on you which exam you find tougher—CFA or CA.
Now coming to your exact question with exact answer, when looked at the feedback of millions of students, CA does look difficult. Not because the curriculum is hard but because of the completion level. Millions of students appear for the exam every day. But the clearing rate is only 2-3 percent.
On the other hand, admittedly, CFA isn’t a very popular choice among Indian students. So competition level here is much low. So more students crack the exam! In fact, clearing rate of CFA is 40 percent.
Also, let’s not forget—Indian courses and exams are notoriously popular for being extremely (and irrelevantly) difficult for the students. And given CA is a home-grown exam and CFA isn’t, it is more difficult when compared with the later one.
In short, CA is more difficult—but not if you work hard.