Hi Anna,
Thanks so much! It's taken a lot of trial-and-error on my part to find the best tips and tricks so I'm just happy to have the opportunity to share what I've learned.
The resort rates and packages are typically released in the late summer or early fall, So you still have a little time to get all of your resort research done! Price-wise there is not much of a difference between the two resorts you listed, as they both fall in the moderate category. You also won't find much difference in the amenities or service levels. Both resorts offer playgrounds, dining, feature pools (with waterslides) etc. The Caribbean Beach Resort recently completely renovated their feature pool, which now includes an incredible toddler splash area.
Now their theming on the other hand, it totally different. Personally, I prefer the Coronado Springs Resort for this reason. I love the southwest theming, it is simply beautiful and spacious and based on this I have a hard time believing it is a moderate resort!
To help you make your decision, I suggest that you visit
www.allearsnet.com simply click on "accommodations" and you will find detailed pictures of every Walt Disney World resort. Good luck!