I think the choice of colours for the FR is excellent now. They all look good in their own way so it comes down to personal preference.
Black looks mean and the side strips are effectively 'colour coded' as standard but, as has been mentioned, you can't see the FR's styling cues quite so well as with lighter colours.
Silver looks quite smart but is a bit common now and is a terrible colour for paint matching all the stone chips which you WILL get.
I haven't seen a Zenith grey FR in flesh yet, so I can't really comment on that, although it looks quite smart in the photos.
I'm not a fan of pale blue cars. Brisa (or Glacier on previous models) is a bit too 'pretty' for my taste.
Crono yellow looks great, much stronger and more positive than Ovni, and hopefully won't fade like Ovni did. I think this was one reason why yellow was a less popular colour on used cars than some of the others.
That leaves Emocion red. Both my SEATs have been red and I really like it. It shows up the details well, is highly visible on the road, which is good from a safety point of view, doesn't show the dirt too badly and cleans up well. All the paints are lacquered now and there is no sign of the colour fading on my car after 30 months and it is an easy colour for spotting in paint chips.
In the end though it's your choice and I think whichever one you choose it will look good.
