I need to correct myself since I miss read the model number; I was thinking of the "Sandy Bridge" i5-2410m instead of the "Ivy Bridge" i5-3210m.
The i5-3210m has the same clock speed as the "Sandy Bridge" i5-2450m. However, it provides about a 5% - 6% increase in performance on average over the i5-2450m which makes the i5-3210m a slightly more powerful CPU.
Ivy Bridge CPUs consumes a little less power than Sandy Bridge CPUs so battery life should be slightly better assuming both laptops have the same battery.
Ivy Bridge CPUs comes with the better performing Intel HD 4000 graphic core compared to the Intel HD 3000 graphic core found in Sandy Bridge CPUs. If you are buying a laptop with a nVidia or AMD graphic card, then this is more or less a moot point.