Litter mates tend to be better bonding companions than bringing two different bunnies together.
But then again, my two litter mates, both boys were fine together. For a while. Once hormones set in and dominance occurred, trouble hit and we had to split them up to keep them both safe.
It all depends on the individual bunnies. And I do believe size enters into it. And the competition for food.
I think your idea of bringing home one bunny first, letting them settle and if you want more, than bring them home individually.
Many articles on here and on search engines to find a way to help their bonding. But don't be surprised if they don't bond. Bunnies are fickle and they choose who they want to be friends with and who they don't like.
I found that out the hard way.
Wishing you luck with your new Holland Lop. Let he/she settle first, than if you want more, which all of us end up getting more they are addictive, a male or female would be perfect, but it all depends on your first.
K