Best exterior gloss paint?

[TowerRingInferno]

For window frames and doors. High gloss black.

Getting conflicting advice from my joiner and the local independent paint store. Water-based or oil-based? Flexible or not? And what is the difference (other than price) between trade and not trade paints (eg Dulux)? Help!

Deffo get oil based. Dulux is a 'trade' paint. Dulux colour centres will match to other paint makers e.g. Farrow and Ball (which was THE WORST exterior paint ever!).

Quite pricey but worth it.