Precision 7510 AC Power Adapter

I recently got a new Precision 7510.  I want to get some extra AC power adapters.  It came with a 180 watt adapter.

I did a search on the Dell website for power adapters for the 7510 and it lists a 180 watt model and a 240 watt model.  The 180watt is Dell part #450-ABJU.  The 240watt is Dell part #469-4547. 

Is there any advantage to getting a 240 watt adapter?  Will the laptop charge faster?

Thanks,

Peter