do I choose the easier niche?

I know this doesn’t matter and that’s it’s my decision. BUT, I have two niches one of them would be easier to market to and I think be looking for an answer right away (women in their 30’s having a baby for the first time that want to get sleep after the baby comes teach your baby to sleep in 12 weeks). or moms that want to feel less mom guilt, love their life and stop yelling at their kids. I think the baby one would be easier. I think the second one the moms maybe don’t know that they want coaching, but I know it would help them so much. So any advice?