Congratulations on the admits! And wow, interesting you are declining Wharton! Much respect to you to genuinely follow your heart on that. I feel a lot of Bschool hype goes around merely ranking and prestige, so it's neat (or daresay, refreshing) to see you very oriented around fit.
Any particular reason you feel you fit better into Tuck than Haas? Very curious, as I feel "on paper" the culture seems similar. I guess if you want to fully immerse yourself into the MBA experience (no city distraction), the rural atmosphere of Tuck would be better.
I think if you want to settle long-term west coast, Haas would be better. It's more than the career network, but also the additional social network you will have after (since so many stay regionally concentrated). Also, I don't doubt that Tuck has people that place into Bay Area MBB/Bay area in general...but I feel like that's a
challenge to overcome, not a likelihood. For instance: go to LinkedIn, search "bay area", "bain" (as current employer); for Tuck, you get 9 people, for Haas, you get 23. (McKinsey ratio 7:39; BCG ratio of 6:18; Deloitte 3:115). Caveat: can be skewed by Haas UG.
I think another thing to consider is placement as it relates to students' aspirations. Your fiance may have the better insight of this, but the career reports will deploy a lot of self-selectivity--i.e. perhaps less Haas students go into MBB as a share of the class because of the regions' dominance in Technology.
Good luck on your decision! Or maybe attend all the admit events and then follow your heart

(Or, flip a coin, and see what your gut reaction is based on the result. You'll know which one you want!)