Intel® Core™ i5-3337U Clock speed 1.8MHz(3M Cache, up to 2.70 GHz with turbo)
Intel(R) Core(TM) i5-2430M CPU @ Clock speed 2.40GHz no turbo.
Intel® Core™ i5-3210M processor Clock speed (2.5 GHz,) (3.1 GHz with Turbo Boost,) 3 MB L3 cache) This one is faster, but do you need it dont pay for something you dont need or may never use.
The rest of the laptop needs to be well balanced.
When I buy like most other people we have a budget to stick to and then do some trawling of the net on that price, find the best up to date PC/Laptop by looking at reviews and best buys.
Then chase down the best price and deal on a couple of specif models.
I wouldnt just judge a laptop on the processor alone, but at the same time I would like to keep up to date as far as my budget would allow.
It all depends what you need the laptop for.