The EX-ZR310 supports a better memory card type than most cameras of a comparable spec and age to it. This camera supports an SDHC memory card, whereas most digital cameras that have been around for around the same time as it support an SD memory card. This Casio camera also supports an SDXC memory card. SDHC cards are DS hards with a higher capacity of up to 32GB. The worst memory card type of all digital cameras that are a similar age to the EX-ZR310 is Eye-Fi and the best is SDXC.
There are a number of alternative digital cameras that support SD, SDHC and SDXC memory cards currently available that you might want to consider including because of it's better review score, the Casio Exilim EX-ZR400 (£309.00), or the Panasonic Lumix DMC-TS5.
If you are looking for a camera with a better memory card type then you might want to look at the Nikon Coolpix A (£292.99) (SD,SDHC,SDXC) which is also higher rated.