You know that I agree with you. "Toughest" and "hardest" is always relative and subjective. There are variables even within the different courses in the same company.
I also heard of the "tough" CX training. Really wish to know how is CX course for comparison. Wonder whether there are similarities to BA's. I have no means to verify but I heard there is a significant influence from BA as there may be a sizeable number of British pilots especially in the beginning.
Thank you for taking the effort in sharing, learning and not be too critical with me.