For me it’s white wines that have a grippy texture on the palate (in addition to freshness and acidity - it probably wouldn’t interest me otherwise). Raveneau is my classic example. I’m not sure if this is actually tannin or something else.
That’s right up there with me too, David . I am not sure that I have a favorite wine characteristic in the sense of the examples. I enjoy having a wine with multiple characteristics that are pleasant, diverse, complex, and play well together. I especially enjoy wines which add some intriguingly elusive taste to the mix which makes me want to have another taste and ponder a bit.