I like the fact that their paint line is more stable (in the sense that they don't drop colours/lines as frequently). Also, in my opinion the dropper bottle is way better than the paint pot. That said, I still buy the odd GW paint if I like the colour or even other brands.
The dropper bottles are very handy. However, I like that GW paints are thicker though. Simply because it is easier to thin a paint down than to bring up the viscosity. I also find the pigment quality of the paints to be very impressive for both lines.
That's a fair point. The fact that GW still uses paint pots for their AIR (brush) paints is horrible though.