Which material would have the best UV resistance?

ABS? Ultrat? PETG?

I'm thinking maybe PETG but maybe someone actually knows. This is for parts that will see lots of sunshine for prolonged periods (years). 

Not sure what technical data says but I have a Zabs print sitting in the sun for the last 8 months and they looks and feel the same. I checked the other day for degradation and I didnt find any that I could notice.

Only time will tell though. lol