I don't think that you need a Laptop for trading, any desktop computer would work fine. If you are constantly on the move then you need a laptop computer. Google search you will find good anti virus and vpn.
This is the major reason why many people will stick to trading on laptop to a desktop trading because virtually everyone is always on the move except pro traders that strictly make trading their day to day JOB and then laptop will still be considered the best especially for countries with very unstable power supply or expensive power supply, desktop require you to stay connected on the electricity too for long, at least we still have some laptops that would stay up to 8 hours after being charged to cut off the use of power supply that will take part of our profit away.