Maybe it's because of the way I play, but I find kids and toddlers a bit stressful. They have have certain skills that are only for those life stages which are also the shortest ones and I try to max them out as fast as possible, achieving at least 2 aspirations as well.
With Parenthood there's also the traits thing which I haven't been able to get for any on my sims (I think empathy and conflict resolution are the hardest ones for me) which frustrates me a bit. I would play around with it more but I honestly don't know how to work with them enough to do so.
I must also say that having the same skills for teens and older sims is also kind of boring for me. I haven't tried it yet because I usually try to stay in one path for each Sim, but I'm sure I could max out most if not all the skills.
In comparison to toddlers and kids which are the shortest life stages with less skills but that are unique to those, we have 4 life stages that are longer and all have the same skills. Which, if you have taken good care of your sims in the earlier stages, are kind of easy to level up. I've teens that already have some skills max out before they age up.
