I haved stayed at both and definitely like All Stars better. Even though they share buses they seem to come faster. Also a lot of tour groups stay at pop. When they go some where it totally disrupts everything. Also Pop is very large and there is only one bus stop at the front. Hope this...
You know that the swan and dolphin are offering rooms in August for just $125 a night. Don't know if this is in your budget but I thought you might want to look into it. But you have to book quickly it is only bookable until 2/14 or 2/15.