Sony Vaio F: ($1534.99) NVIDIA GeForce GT 425M GPU (1GB VRAM) Intel Core i7-740QM quad-core processor(1.73GHz) with Turbo Boost up to 2.93GHz 16.4" VAIO Full HD Premium Display (1920x1080) 640GB Hard Drive (7200rpm) Genuine Windows 7 Home Premium 64-bit 8GB (4GBx2) DDR3-SDRAM-1333 Blu-ray Disc Player Large capacity battery LED Backlit Keyboard
Sony Vaio EC: ($1629.99) Intel Core i7-640M processor (2.80GHz) with Turbo Boost up to 3.46GHz Genuine Windows 7 Home Premium 64-bit 1TB Hard Disk Drive (7200rpm) 8GB (4GBx2) DDR3-SDRAM-1066 17.3" Full HD VAIO Premium Display (1920x1080) ATI Mobility Radeon HD 5650 GPU (1GB VRAM) Blu-ray Disc Player Standard capacity battery
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Depends on what your needs are. If portability and price are what you want go with the Vaio F. If your looking for more power and storage go for the Vaio EC. Good luck w/your purchase!
By specs and price EC laptop is better but EC's battery has just average time... while Vaio F laptop has better battery performance so I think Vaio F is better for you....