For render CPU is crutial(both laptop rams are 16GB)
4910MQ has 9763 points M4800 wins.
4712HQ has 7414 Points
For Display only Resolution QHD and Anti-glare are big plus Draw!!!
for graphics, M4800 wins;
M4800 has three alternatives
2 GB GDDR5 AMD FirePro M5100 Mobility Pro
2 GB GDDR5 NVIDIA Quadro K1100M
2 GB GDDR5 NVIDIA Quadro K2100M
M3800 has 2 GB GDDR5 NVIDIA Quadro K1100M
Aesthetics, definitely M3800
mobility, M3800 wins;
M3800 is 4,15 lb; 1,88 kg
M4800 is 6,35 lb; 2,88 kg
HDD,
you can get a SSD (min 240 GB) and a HDD case. replace Hybrid 1TB with SSD, and put it to HDD case problem solved
hope this helped.