My relationship is different with each of my children, because they have such different personalities. Ds1 does everything fast - he talks fast, he moves fast, he thinks fast, he likes action, excitement, etc. He is more like me in this way. Ds2, when on his own, is much different. He is more of a dreamer, more likely to sit still and play quietly or flip through books or just stare at the ceiling. He takes longer to think about something, and it takes him a lot longer to get his words out. So I really try to slow down and meet him where he is when I can. I try to make sure he gets time to move at his pace.
Ds1 and I have a more intense relationshinp, in both good and bad ways. We have almost a psychic connection, but we also butt heads quite often. Ds2 is more of my love child. I mean, both are very cuddly and affectionate and loving, but ds2 is more "simple" and pure, less complex emotionally. I sometimes think that ds1 is my soul and ds2 is my heart. One isn't more important or better or worse than the other, but that's almost how I tend to connect with each of them.
I don't know that one gets more attention than the other, as the vast majority of the time we are all 3 together. But I do try to make sure that I let each child have some time and space to move at their pace and their level of intensity, and will try to meet them where they are in my interactions with them.