Right, because they will have suitcases, so the underbed storage will be limitedly useful, unless they are there a long time. I have two storage benches for suitcases and a desk, and the room is almost always quite full of stuff, even with groups of 2.
Personally, I would think being sure there is room to move and places for suitcases would be a priority. But I'm a moderate-budget traveler because I'm a mom with three kids, so I wouldn't be your market anyway. Either way,the point is, the issue is beyond price and what will be comfortable for the guests.
You can see the bench in this photo - and there's a smaller one at the end of the twin. They keep the suitcases off your bedding, are convenient for the guests, and offer additional storage for blankets and pillows.