I finished my first Necron army. I want something fun to paint first and then the playability. I'm hesitating between Tyranids and Sororitas.

I finished my 2k points of necron and was a really nice experience. I'd like something fun to paint, I love the Sororitas style with all the aesthetics. I also love the tyranid style and I'd like to have some fun with contrast paintings, but a friend of mine said that tyranids look too similar and it could get repetitive (I'm planning to play big monsters for tyranids because I like the models, so no 40 termagants or something like that). On the other hand, I really don't like half-naked repentas in the Sororitas. I plan to prime in white