According to a report by IBM, looking at browsing and shopping habits earlier this year, smartphones were used more than tablets to access the web.
This is borne out by our own site visit analytics for a client in the education sector in Saudi Arabia. Here you can see that, whilst the visits from smartphones have grown steadily, those from tablets have actually fallen slightly.
It should also be noted however, that tablet visitors were more likely to convert to taking action. The IBM study observed that 12.4 percent of all online sales came from tablet browsers, vs 10.7 percent came from smartphone browsers.