As I remember it.
1. RED Cedar is THE BEST but MUST be painted.
2. WHITE Cedar will grey over time to look like ....."Weathered Shingles"....like on Cape Cod... Good for maybe 20 years...this is what I have in RI....House CLOSE To....but not ON the coast.
Southern exposure (Bright SUN) will curl up first. My North side of the house is original at 38 years and still looks good..like the other three sides which were replaced maybe 15 years ago. It's a match.
I don't think I would use White Cedar in the Woods. BUT: NH may be different. When I replaced my shingles on three sides of the house ~15 years ago they were
"MAIBEC..PR Grade "A" NANTUCKET Eastern White Cedar"..Treated with bleaching oil. These shingles are supposed to be RE-Treated with bleaching oil every so often. I have never done that. They will outlast ME.
NB