The RL is doubtless one of the finest time-only watches in series production today, and like you I admire the focus on chronometry (bested by the RL PLM, yes, but I'm not a coloured metals chap). The WG version is beautiful indeed - I love those blued hands - they aren't just good to admire, they also increase legibility. The blue strap is exactly what I would do.
Intellectually I prefer the idea of platinum for longevity, but those hands and the lighter weight of WG make this a winner too.
Enjoy! What you have there is very special and I'm sure it will bring you much happiness.
Best
E.