The One X screen is only better than the GN screen in pixels per inch. Pretty much every single other measurable metric(colors, viewing angles, contrast, response time, etc..) is considered better in SAMOLED displays than SLCD.
Really.
Colors it is true that AMOLED has a wider gamut but we only use the sRGB range (and in fact, because the AMOLEDs tend to be badly calibrated, people even use custom work to bring it back into line). So there's no advantage there since the OneX screen is more accurate out of box.
In terms of brightness, the One X easily wins so you'll be able to view it outside more easily. It absolutely destroys current AMOLED panels.
Contrast ratio naturally AMOLED wins but it's not like the One X is lacking in that department since it's top of class. In fact, in terms of contrast difference instead of ratio, the One X panel exceeds any AMOLED.
Finally, viewing angles of LCD's are already at 178 degrees. That's far beyond what anyone would need so even if AMOLEDs had 180 degrees (which they actually don't, even AMOLEDs have a little bit of fade on the AMOLED screens I've owned) it'd be a non-advantage.
So we only have marginal victories for a Pentile 720p AMOLED while the sLCD has a clear-cut victory in PPI and brightness. If this had been a Super AMOLED HD+ panel then it's an entirely different story.