Polistygma or livingstonii?

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Looks like both. The big blotch pattern is not clear enough for a livinstoni but I don't see enough small spots for a polystigma.
Stressed livingstoni can show that "dirty" pattern. Polygstima sometimes fade their small spots.
N. polystigma males show a lot of small spots in the pectoral fins that are normaly not seen in livingstoni male pectoral fins. But there are exceptions.
Still I tend a bit towards livingstoni.
 
Looks like both. The big blotch pattern is not clear enough for a livinstoni but I don't see enough small spots for a polystigma.
Stressed livingstoni can show that "dirty" pattern. Polygstima sometimes fade their small spots.
N. polystigma males show a lot of small spots in the pectoral fins that are normaly not seen in livingstoni male pectoral fins. But there are exceptions.
Still I tend a bit towards livingstoni.
He is not really stressed, from 2 weeks lives with similarly sized fishes in 5ft 120g. He is not the biggest one in there but still shows plenty of aggression and 2days ago starts coloring (I hope you can notice that blue shade on attached pic). I have one more stonii in that tank, maybe an inch bigger then this one but less aggressive, I guess its female. B22B3F84-AD5F-48E1-B0E6-606341A00233.jpeg713D647F-E616-452D-A248-8F9574457FAB.jpeg21699293-C1B5-431E-B3E9-6AA279DBC059.jpeg
 
That really looks like a polystigma to me, but u/milingu is right about the small spots.

I would still bet on it being a poly
 
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