Here the writer does not want to talk about which company you should choose, but please note that there are some things to tourists after choosing travel companies to buy tour.
With the big travel company having brand: the tour should be registered early to enjoy the promotions (eg Vietnam Culture Tour travel agency discount 5% for customers who register before 7-day); or sign up for group tours to be discounted (most travel companies have this policy). If you choose long day tour, far away, the travel company which has branded is the best choice of you.
With small companies: Most small companies often do retail customers booking agent for large companies, medium companies to commission, buying ticket at these companies is at or below the price of the tour of the parent company (the companies automatically reduce price to ease in booking Hanoi package tours), so you need not worry much when buying tour in these companies.
With guest in group tour or large corporations, you should seek information about the company before deciding to buy tour: search on the internet, via the company’s website … before deciding to buy tour.