[H] QHD WLED

[Winterlight]

I have a 15 inch quad core Thinkpad with 16GB of RAM and a 512SSD 
that can operate as my mobile workstation, but I need something I can 
carry around with me in a messenger bag, and work as a laptop/tablet 
which is why I am getting a HP Spectre X360 convertible. I know the 
specs I want, but I can't make up my mind about the display. If it 
was a 4K choice I would be all in, but I am not even sure what Quad 
HD would be used for, especially on a 13 inch screen. Is QHD worth a 
100 bucks?
I need the collectives advice. Comments and advice appreciated!
 13.3" diagonal Full HD WLED-backlit IPS Display (1920x1080) Touchscreen

 13.3" diagonal QHD WLED-backlit IPS Display (2560x1440) 
Touchscreen  PLUS $100