OK so I answered this question before so for people who have read it there may be some overlap.
I understand why Leyton ended up together and I can respect the descision but I still ship Brucas over Leyton for a few reasons.
1) In my opinion Lucas and Brooke/Chad and Sophia had better chemistry. Even
after the divorce, their onscreen chemistry never wavered and that
really sells me on ships.
Just, I find there is such warmth and longing and intimacy in their stares and their hugs and it really feels like a coming together of two people, it really feels like they’re good for that moment that they’re in each other’s arms and a lot of what makes a couple work is the things unsaid that’s communicated through their physicality and Brucas really had that whereas Leyton to me felt colder to me even at their most intimate, even at their goofiest, I just didn’t get that connect that the show was working so hard to convince me that they had. So that’s one reason.
2) I think Brooke and Lucas complemented each other even though that was
supposed to be Leyton’s foundation. Lucas could see Brooke’s potential, he
could see that she would do great things, he could see that she had
a ponderous and serious side while also accepting and rejoicing in her
extroverted, fun-loving side while I believe Brooke made Lucas a better
person, more selfless and aware of those around him, which is why in season 2 Mouth tells Lucas that he’s loved Brooke for a long time but he didn’t mind seeing her with Lucas because they both had big hearts. While with Peyton I just felt like Lucas was too wrapped up in their cosmic, doomed love, which actually relates
to Peyton individually — with Lucas, she was a terrible friend and was a lot more
self-righteous but when she was with Jake (Jeyton is another couple I
ship because I thought they got the angst and the lightness at an exact balance that Leyton just couldn’t achieve:
) she was more caring toward those around her.
3) which is related to 2 I think Brooke and Lucas were truly themselves
when they were together. Something about Leyton, it was like Lucas had
to keep up his tormented, brooding persona in order for that relationship to work whereas with Brooke there was more dimension to who he was
and vice verse. But of course these are all just my interpretations ;)