Hey there

Both are good. First if you'll do MBA+BBA then ofcourse you'll be comfortable with the studies during your MBA as MBA course has various things which BBA students feel easy to understand due to their commerce background. On the other hand BTECH+MBA is a famous combination as most of the companies need MBA and those who are from technical background have benefit that they lead the tech team of the company and they find it easy. Also it is seen that Btech students find quant and lr, di easy during entrance exam so these are the benefits for engineers. But at the same time engineers because of their non commerce background find the course little difficult at starting as they do not study anything like that in past.

Good luck