CBR really is very spread out, but they have various bus stops and even an internal loop bus so you dont need to walk all the way to the main entrance for your bus. And double skyliner lines, as you mentioned. Meanwhile while Pop is less spread out, it only has the one bus stop and shares the one skyliner with art of animation
Amenities wise, CBR is a moderate resort, Pop is a value. That does mean Pop is cheaper, but also that CBR has more to it. CBR has more food options, and more theming to the pool (which the 3yo might like more). Room wise I feelCBR is slightly larger but I'm not 100% sure. I do prefer the overall look and quality of CBR over Pop, but that's a question of my personal taste in theming.
I like Pop and am fine staying in it again, but I would only do it over CBR when I'm on a budget since the difference can be around 100usd a night. In fact, I'm considering doing just that in my next trip, when in the last I stayed in CBR, because I want to stay for a longer period and think the amount I'm saving per night can be better used elsewhere and I have some slight trauma related to CBR due to receiving some very bad news while I was staying there, but that's not CBRs fault