VW Golf Anniversary - ABS or fibreglass spoiler? - sydney the oz

The bottom front spoiler has been stolen off the Anni. Got to pay to repair it myself as the no-claims position will be worse than the potential cost of replacement.

What are the pros and cons of replacing it with either an ABS or a fibreglass one? The car is a very good example and a genuine Anni, I'm likely to be hanging onto it for some time.