By numbers alone a standard room (690,000₫/hour) is often enough. Still, VIP is what most business hosts book (890,000₫/hour): the extra 200,000₫ an hour buys a noticeably better room and shows the guest some thought. VIP rooms seat up to 8 guests; room 601 takes 10–12.
VVIP 602 (1,450,000₫/hour, up to 20 guests) is for senior counterparts or a deal that really matters. There is only one, so book it as soon as the date is fixed.