The 700m is the inferior laptop. I have seen and worked with both.
Sony's battery life is better with standard battery, screen is better as dell's is merely like putting a nushield over it, whereas the sony's seem to have two backlights in place. The sony has discrete graphics. The sony arguably looks better. Most importantly, the keyboard is quite a bit better. That is my main fault with the 700m. Just too small, specifically, the period and question mark and comma keys. I'm a touch typist and you usually accommodate to it, but I don't have confidence in it, always subconsciously figuring out where certain keys are. Just like an old inspiron whose backspace was the same size as a regular letter key. I swore never to do that again. It's these little things that unless you do heavy duty research or see it live AND play with it for a while, many people don't realize, or at least I didn't.
Other than these quibbles, the 700m is a good laptop. Mainly the keyboard for me. If it weren't for the keyboard, I'd be in business with this laptop.