Given only those two choices, and assuming they are similarly priced and the CPU is the same speed, I would go with the HP ... purely because of screen size.
You might want to ask this in the Administration forum, as it has the best information and the best informed people there.
What are the details on the processor in the HP, particularly the model number and clock speed?
If mobility matters to you, how much do the two weigh, including the power supplies?
If the processors are comparable and the weight differences don't matter to you, then I would agree with Kelvin.
in the HP web dont have the model or number of the clocl speed processor. only indicates the third generation
the weight is 3.8 kg for dell and 4.2 for HP
the screen is not a problem for me, because I have 2x 24" Dell Ultrasharp
the prices are similar, + / - 300 usd
am using the M4700 Dell laptop RUnning Solidworks 2013 and Flow Simulation as well. Have no issues with the laptop so far and its working great. As for the screen, I believe anyone doing any serious SolidWorks or CAD modelling should at least hook up their machine to a larger Screen.
So i would think the screen on the HP wouldn't be the determining factor here.
I think it boils down to personal brand preference and the actual design??
Just my two cents.
Currently I have the last model of dell M4600 Running Solidworks 2012 with cosmos and Siemens NX 8.0 with progressive die wizard.
the laptop running well. but i think the prossesor (i7 second generation) and the memory (6gb in ram) think I want a change for the better.
I have dell precision T7500 too. love it.
but some people have told me that HP is better in workstations
I buy the HP for 4,500 usd