Both have almost the same spec. Personal preference
For me, the Inspiron series are abit less sturdy

Added on August 4, 2012, 10:52 pmSims 3 is not exactly very graphic demanding
Bigger screen will have heavier weight.
Can try these:
Dell
Inspiron 14R (Special Edition), i5-3210M + Nvidia GT640M(28nm Kepler)@RM2199[2.38kg], 4GB, 500GB(7200rpm); backlit keyboard optional
HP
[Ultrabook] Envy4-1043TX/1053TX, i5-3317U + AMD HD7670M + [32GB mSATA + 500GB(5400rpm)]@RM2599[Beats][1.75kg], 4GB, W7HP
Pavilion G4-2006/2007/2008TX, i5-3210M + AMD HD7670M@RM2199[2.19kg], 4GB, 750GB(5400rpm), W7HP
These are 14" laptops. For 13", it is more expensive and not suitable for gaming. Same goes with Sony Vaio series

thank you so much! i was just about to consider buying a vaio but from my previous vaio
it's good but always lagging.