I think it comes down to the fact that you can't go wrong with most of the ornamentals.
I am growing the Little Elf, Bolivian Rainbow, Numex Twilight, Largo Purple and the Starburst.
All are great looking plants and my partners kids love them...
My pick is the Bolivian Rainbow. It has great colour and flavour, But really they are all very pretty and you can't go wrong with any of them....
The only thing i will say is that the Numex Twilight is 120 days to ripe. most others in the above list are only 75 - 90 days....
Hope this helped...