The problem for events is that they're only open on one side.
If you tend to take a van for your stall, I'd advise the ikea ones. I have a few which have been to various events - they go together and come apart real easy and travel surprisingly well wrapped in a couple of blankets.
One side open means if someone's looking, they block the view for others and people dont try. All sides open means viewers can usually see what's of interest and by the time you have 4 sides of a cabinet blocked by iterested gamers, others will wait to see what the fuss is about
YMMV, but its proven itself in my experience except for well known ranges.