As ubiquitous as they may be, Trek, as they have always been very well built, withstood lots of my abuse, and done what I have wanted them to do.
Wilier for road. I don’t know what it is, but the moment I saw one of their bikes, I fell in love, and now that I have one and it suits me so well, that love has only been affirmed.
I would also now Genesis to my list. And BMC appeals to me for some reason.
As for type, I suppose if I could only have one bike, it would have to be a gravel bike, insofar as it would give me enough of a road experience to keep me happy, but still allow me to go somewhat off-road when the mood struck.