How do you test which is better?

I have a confusion if anyone can help. I have an old laptop and I ran few tests on it:

Pcmark07 - 4135 score

3D Mark Ice Storm Test - 25902 score

To replace it, I checked the score of HP's Spectre X2 (http://www.trustedreviews.com/hp-spectre-13-x2_Laptop_review_performance-heat-noise-and_Page-2#tr-review-summary):

Pcmark07 - 4023 score

3D Mark Ice Storm Test - 32232 score

So, does it mean it is a good buy, considering the high 3D Mark score?! Is it a representative of gaming and general performance?

Note: My laptop is kind of 4kg big gaming setup with ATI Mobility Radeon HD 4670(1x) and Intel Core 2 Duo with loads and loads of ports. X2 is a thin convertible with the latest low power processor.