Desktop pc or laptop in 2018 ?

Laptops aren't quite there yet in 2018. You will need to compromise if you go the laptop route. You could easily have a mini pc that is overpowered for the price you will pay for a gaming laptop.

Downsides to laptops/gaming laptops:
heat spots upwards of 65C (Diff temps for each laptop)
Battery lifespan on the downside.
Gotta bring peripherals everywhere

Upside:
Portable

Is it worth it ? Not for me.