My clan tartan kilts (McIntosh) are by far the most important to me. It doesn't matter to me what my clan tartan looks like; if my clan tartan was pink and puce I'd still wear it proudly.
I also wear Hunting Stewart because I wore that in the reserves, and I have a 4 yarder in the British Columbia tartan (which is not a particularly attractive tartan to most people) because that's where I was born and live.