For me that would depend on where I am. If I am in Bangkok, for example, I would most likely choose a motorbike. I'm not afraid of motorbike taxis and no getting stuck in heavy traffic as you would in a car.
As long as I've lived in Thailand, and even before living here when I would come on holidays, I regularly use motorbike taxis whenever I won't be using my car. I've never had a problem and it is rare that motorbike taxis are involved in accidents.
If for some reason I think the motorbike taxi driver is driving unsafely, I have a surefire method of coping with the danger. I shut my eyes . . .
Anyway, this app obviously is a very good one and posting about it is going to help it succeed. Why didn't I know about this before? How long has this app been available?