It's only fair to point out that your name is more difficult than most to remember correctly. Even Kristina poses a challenge with ambiguity: Kristina, Christina, Christine, Kirsten, etc.

If you go by Kristina Colpitts professionally, then people are likely to search for you by that name, which could lead them to interpret KristinaBlair.com as belonging to someone else.

Women who use a married name face an added risk, since divorce affects their online presence. That may not apply to you.

Really, I wouldn't be very enthusiastic about either of those domains you mention.

Domains, branding, and naming are what I do professionally. If I understood your objectives, business, and background, then I could advise you better. There are certainly options you haven't considered.

Call me.