10x20s and 10x30s are most often in the linear configuration. The space allows room for more people and even a seating area. You’re still limited to an 8-foot height restriction in all standard spaces.
In an exhibit hall, some 10×20 or 10×30 spaces are going to end up with an aisle on one side, otherwise known as a corner booth. Corner booths are nice because you get more visibility from two aisles instead of visibility from only one.
10 x 20 displays are often designed to be reconfigured into a 10 x 10 booth. Upon request, the display can be designed so that it could be divided into two 10 x 10 booths. Packaging and spacing becomes a little more complex, unless of course you’re simply going with two standard booths and putting them next to each other. Then it’s really quite simple.
One configuration to be wary of is a 10 x 20 peninsula . In this configuration the display backs up to another 10 x 20, perhaps even a 20 x 20. The rules for peninsula booths are much more restrictive than a standard linear display. Island spaces also have similar restrictions.