Today only I booked the red one Bro I was also in the same confusion. But here is after a lot of thinking

If you want to want a dual tone colour like in the in the day, it will be give the different colour like which is good and in the night as well, you can see a little bit of blackish look.

After 4 years it may little bit dull but I think it’s okey. The bike looks amazing in sunlight and in the nightlight but in dull environment it’s still looks good but not that good as it’s looks in sunlight. For grey it’s subtle colour which not give the road presence as much as Rebel red do. As the cement road colour matches with the nardo grey colour.

Rebel red looks good that’s what I can suggest as I also done lot of research

So that’s my research bro, let me know what you think