E5440 video question

I'm thinking of buying a Latitude E5440 specifically as a cost effective option of getting 3 external monitor support from a laptop via a docking station. This to replace my e6420 which only supports 2 external monitors.

I'm a developer. I won't be playing games. I may play/ process the odd video. I will be maxing out the RAM to 16GB if it makes any difference.

Now I see that the E5440 comes with either the Intel HD 4400 or NVIDIA GT 720M.  I have my eye on the Dell U2515H (2560 x 1440 at 60 Hz) so might end up getting 2 of these along side a lesser 3rd monitor. I'm pretty sure both cards will support this configuration but correct me if I'm wrong.

My question: is there any benefit of getting the NVIDIA GT 720 over the Intel HD 4400 (or vice versa)given my usage scenario above? Or does it make little difference.

Ta in advance. I note this is more of a pre-sales than a support question if it is better directed elsewhere.