I’ve worked in both areas, but mostly do Toy Design.
I see the Juvenile Product stuff as way more challenging. It’s so much more involved: safety concerns, “grow with me” features, and you’re always asked to find a new angle whether it’s a new product configuration, patentable mechanism, etc. While you stil plenty of those concerns in toys, the products are generally simpler, more fun, and more fantasy based. Plus the toy development process is much faster than JP, which I personally prefer.
I think even though I’ve done a ton of toy work, there would be a HUGE learning curve to move into the JP category. On the other hand, it would be less of a learning curve than if I was coming from computer design or something.