Answer by Melinda Samson · Apr 20 at 02:30 AM
I've used each and they are both good. WhatRunsWhere has deeper coverage of fewer countries while AdBeat has broader coverage but is shallower. WhatRunsWhere allows you to try it for $1 for 3 days so you can determine if it suits your needs. AdBeat does not have this trial but they have 30 day money back guarantee so if you are unhappy you can request a refund.