I actually like the mcmasteri group. I had wild veijitas a couple of times, and bred them. I think my favourite Apistos are veijita, cacatuoides, njisseni and borellii. Very old school and not cutting edge new finds (though njisseni was when I first had them), but I like the higher body shapes.
What I see here as veijita is often cheaper than what they sell as mcmasteri, but the colours are so linebred it hardly makes a difference. Right now, the veijita types are the most common Apisto in this market.
The iniridae group never caught me. Nice little fish, but while I kept a few, they never became favourites.
Early on, I found a small French book on West Africans, and only got into Apistos when I couldn't find those fish. Now I can find Africans, though not easily. The iniridae group is nice, but Nanochromis and Paranochromis are more interesting (to me). Not all are colourful and some are the opposite of flashy, but the complexity of behaviour.... Steatocranus are also characters, and I never tire of good old Pelvicachromis.
If all goes well, I'll have my second round of dwarf Cichlid and killie collecting this winter, this time in West Africa rather than Central Africa. That's still being worked out logistically.
In the direction of this thread, what
@Magnum Man said about forgetting the type is a nagging thought. You can't just put any Apistogramma male in with 2 females and expect good things. If you get the wrong species, at best they'd ignore him (which would defeat the fishwatching purpose) and at worst they'd kill him.