Using phone to trade has its leverage and using laptop or PC has its own leverage. Phone are very easy to handle and you can carry them to anywhere you want to go. You can be anywhere with your phone and decide to open an order or close the one you already opened if you decide to change your mind and you don't need to do much stress on your eyes just because you want to open trade, easy and demure with less stress.
Each one might have its own leverage but if not for size am sure almost everyone will want to go everywhere with their laptop and some people still do you will always see they with their bag pack on the back so even with the size their people who will choose laptop over phone, and every have a reason for what device they choose to use and their people that prefer tablets to so the choice is for every individual to choose the one they want, and the same way their are people that are comfortable with lapto Same for phone to but me personally I can go with anyone.
While laptop might beike a heavy load, what it can do the phone can't do it. I have notice that when you open plenty of tabs on your phone, your exchange doesn't function and it lags because you are sharing network on the background with other applications but on a laptop with good processor and good chip, your trading experience is going to be smooth likewise charting of trade with tools, it's smoother when you do it on your PC than phones.
Their laptops that are actually very light that can easily be carried everywhere and laptop has more advantages and the speed of a laptop can be compared with that of a phone and you can do multi task with you laptop and phone is limited since you can only do one thing at a time, even people that feleels phone is better is just because they don't want to go everywhere with their laptop maybe because it's heavy, even when am traveling I still prefer my laptop than my phone just that phones last longer than laptops during usage.