Tough one for me, both great little fish. Got a shoal of 5 Glowy's and 3 Neon's in the same tank.
The glowlights are so easy to keep and have snubbed any problems I've had in the past. Were as, understanderbly a couple of Neon's were lost. On the other hand Neon's look great and the blue and red really shows when in good condition.