Neither. Try to get something with a half decent NV card (ATI/AMD is too buggy with OpenGL).
But if you have to absolutely can only have between those 2.... assuming we're talking Intel HD, the 4000 is a major upgrade over the 3k, DX11 support, more shaders, and a handfull of other improvements. The only caveat I've seen a few reviews mention is its going to have slightly higher heat density, so when researching prospective laptops, make a note of any heat related complaints.
If anything go for a laptop with a dedicated GPU. Before I got my graphics card for my PC my processor came with Intel 3000 graphics. It ran Minecraft at a mere 15 FPS. But I can't say for the 4000 graphics I just suggest getting a laptop with a dedicated GPU they are really common and not that much more expensive.
But if you have to absolutely can only have between those 2.... assuming we're talking Intel HD, the 4000 is a major upgrade over the 3k, DX11 support, more shaders, and a handfull of other improvements. The only caveat I've seen a few reviews mention is its going to have slightly higher heat density, so when researching prospective laptops, make a note of any heat related complaints.
Is it good for minecraft?