I believe for selecting Laptop for designing Purpose should consider
- High speed Graphic Card Compatibiity
- High RAM atleast 6 GB to 8GB
- High Speed CPU 7th generation these days
- Last but most important Bugdet
WE use Apple MacBook Air MMGG2HN/A13" Laptop(Core i5/8GB/256GB/OS X El Capitan/Graphics for PCB designing
Other choices can be
Dell Inspiron 15 N5559 HD Touch Core i7-6th gen 8GB 1 TB Window 10 4Gb Graphics
Asus ZenBook UX305UA-FC013T Laptop (6th Gen Intel Ci5/ 8GB/ 256GB SSD/ Win10)