Says the forest runner :3
Anyhow, if I had to choose, it would be Sweetie Belle.
You may ask "WTF are you thinking, you're a Scoots fan"
Honestly, I think Sweetie Belle would be an easier, more pleasant option to take care of.
She has an amazing voice so she can sing for me, she's intensively cute for the cuddles, really sweet, and also a little filly so I would get to see her grow up and care for her. :3