Bryan was her final pick because:
Rachel was highly attracted to him and vice versa.
He came on the show for Rachel, after his friend nominated him. He had expressed that she was the kind of woman he wanted after seeing her on Nick's season.
He was attentive to Rachel. He focused on her and their building relationship. Everything else was background noise.
He showed her he desired her (For instance, he was non withholding of his affection from day one. When they conversed he leaned in when he spoke to her to maintain their physical connection. That's speaks to intimacy.
He was direct with his intentions.
He was unwavering in his commitment to see what they were building through to the end; he stayed consistent in his words and actions toward Rachel.
He always checked in with her emotions; how do you feel? Are you okay? What can I do to help you feel better (for example: the back massage). That speaks to care and comfort.
He was affirming instead of negating.
Their lifestyles are complementary. His career and finances is complementary to Rachel's. They both have professional degrees and are working in their respective fields. He has the flexibility to relocate if need be. So does Rachel.
He loves Sports Center (like Rachel)
He's older and maturer than most of her other suitors.
They had plenty of deep conversations, about what they wanted and those wants were compatible. Both have stated this in their post show interviews (but those conversations were left on the editing room floor. The show wanted a certain narrative. Their discussions didn't fit that narrative).
He was/is marriage minded. He is at a place in his life where he's ready to settle down. He said he wants ot get married. He wants three children (Rachel wants 4 lol). That matches up with what Rachel has said to want all along; marriage and children.
He gave her little gifts throughout their journey (others did as well, but I thought I should still add that to the list).
He showed his generous side by sharing his clothes with Dean during the show (even though Dean did not seem as fond of him as others).
During his hometown Date, when his mother criticized his haircut, he stated that "As long as Rachel likes it, I'm happy." - That was sweet, and revealing. Rachel comes first.
He asked Rachel's father for her hand in marriage, and her father gave the blessing (this speaks to traditional values of marriage. Again, that matches up with Rachel's ideals.
His parents have been married for over 40 years, so like Rachel he has a great familial foundation to draw upon. This is another match with her lifestyle.
He takes care of himself - well groomed and fit.
Most important, he told her he loved her without qualifier or quantifiers.
In Rachel's words "He seemed too good to be true."
His post show words and actions have done nothing but validate the man he presented himself to be - To Rachel, he is The One.
Oh and he (Bryan) has a good Credit score, she asked her final three about that. Possibly a good stroke game as well (if we are to surmise they slept together in the fantasy suite) lol That is all!
Rachel and her sisters looked gorgeous in their white dresses. Everyone looked like they were having a ton of fun.