Benefit of gaming laptop is graphics card. Pay big money for powerful graphics cards in a laptop.
For trading or backtesting your big thing is cpu and ram. Built in graphics is plenty sufficient. Better to direct funds towards quality, battery, cpu, screen, keyboard etc instead of dedicated graphics.
All gaming laptops have horrible battery life due to the graphics card and their all quite large. My sager gaming laptop weighs probably 8 lbs and the charging brick is the size of a brick and weights 2-3 lbs itself.
Unless your a content creator, it’s unnecessary. I’d be looking at dell xps, Lenovo thinkpad, or surface 3. I’d pay attention to how modular they are for components. As far as budget laptop I’ve had good luck with Asus line ups.