I have some experience of both...here goes:
1. Our fibre-glass poled Peakland Hartington is incredibly strong due to its dome structure, it barely moves and we've never lost a pole.
2. Our fibre-glass poled Gelert Horizon lost 2 poles in a very strong gale (we repaied and sold it).
3. So then we went to a Khyam Cleveland with metal poles. It took a few batterings but it shook a hell of a lot. One day we were next to a metal-poled Royal which ,when in strong wind, the poles buckled and snapped and the tent ended up in a wet mess on the ground.
4. We are now on a Kampa Bude 4 with reinforced poles in a semi-geodisic form and thus far we haven't had a single problem.
5. We use steel Deltas whatever the poles/tent.
Good luck!
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