Schools here are average the only difference is in price. Just keep in mind getting a seat is hard so you need to plan in advance and contact the schools. My kid goes to American Academy the school is pretty good and they are now par taking in different competitions even with universities. This gives a great jump start for your childs future.
We've got a pretty comprehensive list of schools in the emirate on International Schools in Dubai.
I'd also recommend having a look at free, downloadable Dubai Schools Guide which expands on the content we have on the site.
Best of luck,
Xavier