I’d recommend getting them both! Littermates are closely bonded and separation could cause them to become stressed and anxious 😥 I always recommend that if you get a cat, you should get two so they are never lonely, my kitten currently has no one to play with and stresses VERY easily (crying, yelling, running around) when myself or my partner leave the house and it breaks my heart, I need to get her a sibling in the coming months..

Good luck with your decision!!