Kinda a biased statement there since both have fans. It might just be because the Fray is covered more widely in the US. The fact that they're actually a US band might help in that factor.
As for me personally, I've been listening to the Script more frequently recently. Mainly For the First Time since that is possibly my current favorite song in the romance department. Unlike a lot of the songs talking about young love and being together forever, I kind of always imagined For the First Time as a song about struggling to be a family but trusting that they'd succeed. That's what I like about that song--how it's different.
I'm not the most avid Script fan there is, that's for sure. I won't be attending any concerts in the near future. I haven't listened to all of their songs either. But some of them are unique and good. Of course, some of them aren't that great and somewhat generic, but no band is perfect.
If I had to put the songs I've listened to in order, it'd be something like this:
1. For the First Time
2. The Man Who Can't be Moved
3. Breakeven
4. Nothing
5. If You Ever Come Back
6. Science and Faith
7. Exit Wounds
8. This = Love
There were a few songs (Science and Faith, Breakeven, Nothing) that I really used to love, but have gradually grown bored of.