The view on the double-decker bus will be more comprehensive and beautiful than experiencing it yourself by motorbike, however, focusing on taking photos will make you feel sick, and you won't be able to stay and check in with the locations. I went on the weekend and couldn't go to Hoan Kiem Lake. There are 2 double-decker bus companies, so when buying tickets, read the company carefully. In general, if you haven't been, you can try the experience, but if you have to go again, I probably won't go again.