The Glasurit is probably a little costlier... honestly can't tell the diff between the 2 coz, they are diff colours.
But another important aspect ( which I have recently learnt after the fact) is the quality of the clear coat and it's mixture, and application technique.....
Soild black is really difficult to maintain.... swirls and scratches show up really easily, not to mention the dust!
But, it looks soooo much better than the Diamond Black...
If you rajin to take care of it like an obssesive kiasu parent, then by all means... It looks killer!
Good luck!
For your inspiration...... here's a shot of the reflection on the solid black!
You can't do that on the Diamond black.... hehehe!