What laptop are you looking at?
In general, the GT 610m and GT 710m share the same relative performance level compared to Intel's iGPU. The older GT 610m is considered weaker than the older Intel HD 4000 (Ivy Bridge), and the newer GT 710m is considered slower than the Intel HD 4600 (Haswell). That is overall performance across the board and can very from game to game.
If the GT 710m is in an Ivy Bridge generation laptop (i3-3xxx / i5-3xxx / i7-3xxx), then it is worth getting the GT 710m. If the GT 710m is in a Haswell generation laptop, then you are better off with the getting a less expensive laptop and rely on the Intel HD 4600 iGPU.