Definitely mixed! It's wonderfully interesting.
I have 10 right now (7 girls and 3 boys) and they are 14 weeks old. I did get two of several kinds though. I have 2 Australorps (they are THE SOFTEST ever on the face of the planet!!) but they usually don't hang together. Sophia is towards the top of the pecking order and Chloe at the bottom. I have 2 Golden Laced Wyandotts but they usually don't hang together either as Abigail is at the top of the pecking order and Rebekah towards the bottom. I have 3 NH Reds (2 boys - Sammy and Wyatt (I'm only keeping Wyatt) and one girl, Roza). Those roosters are vying for the #2 rooster position right now. I think Roza is next to last on the pecking order). I have a Dominique, Tess, who's in the top middle. And I have Bubbles, a Salmon Faverolle, who is just in her own little world.
Stu is our freebie exotic chick that is a Cuckoo Marans. He's top dog right now but he's not staying. I only need one rooster for my flock.
I am very glad I got a mixed flock. Even though I got two of several, their personalities are totally different. I would totally recommend mixing.
I have 10 right now (7 girls and 3 boys) and they are 14 weeks old. I did get two of several kinds though. I have 2 Australorps (they are THE SOFTEST ever on the face of the planet!!) but they usually don't hang together. Sophia is towards the top of the pecking order and Chloe at the bottom. I have 2 Golden Laced Wyandotts but they usually don't hang together either as Abigail is at the top of the pecking order and Rebekah towards the bottom. I have 3 NH Reds (2 boys - Sammy and Wyatt (I'm only keeping Wyatt) and one girl, Roza). Those roosters are vying for the #2 rooster position right now. I think Roza is next to last on the pecking order). I have a Dominique, Tess, who's in the top middle. And I have Bubbles, a Salmon Faverolle, who is just in her own little world.

I am very glad I got a mixed flock. Even though I got two of several, their personalities are totally different. I would totally recommend mixing.