|Whisper White on the left/Watercolour Paper on the right|
I thought I'd make a direct comparison between the Whisper White card stock and the SU Watercolour Paper. Notice how you get a more vibrant effect on the Watercolour Paper? The Whisper White has a more muted effect but because the water has warped the paper a little I'd be more inclined to use the heavier card in future. Another option would be to use the Shimmer White, which I'll try once my order comes in.