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I do like SKS guards having used them previously (and have a pair for a current build) but that was the difference I found, the metal guards were quieter and more robust, not sure on weights but the Alu VO fenders aren't heavy.
Your triple setup gives about 1 1/2 less gi than my double, so not a huge difference. Always scope to fit a 38/40/42 cassette of needed. I think developments in cassette sizes mean people can reconsider traditional arrangements.
I think I would have welcomed a mtb triple and a 22 granny ring at some points but I would probably be sat still spinning up the hills now.
Plastic fenders rattle/snap.
Doubles/compacts are fine for touring with a 36t cassette, if I can manage the mountains in the Balkans on that configuration then nobody should have an issue.
It's a Rando bike.