Cute little buggers!
I'd say P. semicincta. The current taxonomy has P. kuhlii differing from P. semicincta based on where the fish is collected. P kuhlii is collected only on Borneo and nowhere else. P. semicincta is found in several places on the Malayan peninsula and Sumatra. Because it inhabits a more expansive geographic area, P. semicincta accounts for a far larger percentage of the Kuhlis collected and sold in the ornimantal trade. So, at this point whithout knowing the exact origin of a given fish, odds are it's not from Borneo and hence not P. Kuhlii.
The day is not too far off when some ichthio-geneticist will sequence the genome of the different banded Kuhlis an we'll know for certain if the 2 species are indeed separate or genetically identical.
My best friend is a cat.