If you look at that Bianchi Oltre and feel the love, then get that. Get another set of wheels later.
Giants are reportedly very well made frames and come with an exceptional warranty in the US.
I think the Scott RC with the integrated cables looks pretty slick. They do seem to have 10 different RC models so it’s not clear which one I’m looking at.
The Vitus would be my last choice.
Personally, I always go with the frame I love and then hang parts on it.