I think trikes are more common in the recumbent world; in fact they seem to be the most popular segment of the 'bent market. The Catrike Pocket is made for shorter people.

Them Brits even race upright delta trikes. But from the looks of them, they're almost all custom.
Lightweight Racing and Touring Tricycles and Conversions
Probably harder to throw a leg over than a recumbent trike, too.