For starters, the Intel graphics (any model) aren't great by any stretch of the imagination. Discrete cards like nVidia and AMD/ATI are preferred, but seeing how this is a laptop, your options will be severely limited. According to Artlatnis's minimum hardware requirements page, they advise a 256MB OpenGL graphics card. They recommend a 512MB OpenGL card.
Given your software that you'd like to use it for, I'd recommend against relying on the Intel HD 4000 to do any rendering for you. Find a laptop with a discrete GPU.
I didn't realize your question was a comparison and I guess my answer is more of a recommendation and not an outright answer. My bad.
I should have specified that in your particular case, using applications specifically for OpenGL rendering, in my opinion make the Intel 4000 HD a poor choice. This is not to say the Intel 4000 is completely worthless, but in terms of 3D modeling and rendering, I'd try to find a discrete GPU.
Here's some benchmark information about OpenGL benchmark scores (Cinebench R10 32Bit OpenGL & Cinebench R11.5 OpenGL) from the URL Dennis supplied (notebookcheck.net). Maybe some numbers would help make my point about OpenGL performance.
For the lazy:
Cinebench R10 32Bit OpenGL in [brackets] and Cinebench R11.5 OpenGL scores in (parenthesis)
- AMD Radeon HD 6970M [7968.2] (53.3)
- AMD Radeon HD 6770M [6818.3] (48.2)
- NVIDIA GeForce GTX 485M  (46.7)
- NVIDIA GeForce GTX 670M [6124.4] (45.5)
- ATI Mobility Radeon HD [6269.6] (32.6)
- Intel HD Graphics 4000 [4855.4] (15.8)