If you're day trading full time and you have all the time in the world for it...and you can only choose one of those devices, which would you choose...and most importantly, why that one instead of the others?
I haven't day traded for hours in a long time but still I make use of my laptop anytime I want to trade, laptop makes your analysis limitless. The views from the chart would be bolder and clearer. The mobile screem is small compared to that of your desktop or laptop so they'll be more preferable options.
My Mobile could be used to just stay updated with the market using my app that's if I need to do some other stuffs that'll involved me leaving my desktop for some seconds.
Secondly for the security reasons I'll still have to go with my laptop as my mobile is used to access more unsecured sites compared to my laptops. For example my social medias platforms, gaming platforms etc are all access with my mobile so just to stay security cautious with addition to other benefit of using a larger scream, my laptop has to be my go to option.