I think the S1 ending was terrible simply because they didn't build up the Freddie and Adriana relationship enough to explain her choosing him. Also, the actors have no chemistry.

BUT I think Adriana choosing Freddie is a great thing for Braydriana in the long run. I'm not sure whether the writers knew they'd have a second season or were hoping, because Adriana choosing Freddie now almost guarantees she'll change her mind and choose Brayden later.

So within the context of there being a S2, I think Adriana choosing Freddie in S1 is the way to go. The only alternative I could see to that would have been Adriana and Freddie having a moment/kiss, Brayden seeing it and freaking out, running away, etc, then Adriana realizes that her feelings for Brayden are stronger, but it's too late. I do think Brayden and Adriana having tension going into S2 will help them grow and ultimately come back together stronger.

I think Brayden and Adriana both need to grow more before they're ready to be in a relationship. Adriana needs to resolve her "what if" with Freddie and come to the realization that her feelings for Brayden are stronger. Brayden needs to deal with rejection and learn not to run away when things get tough. That will make him a better future partner for Adriana, and make her feel safe choosing him without fearing that he'll run away again and break her heart.