Yes, I prefer laptop. My country has a crappy internet and also expensive so I can only afford a pocket wifi. A pocket wifi needs to be connected on the pc by a cable while laptops don't. So when the internet connection is making me laggy, I need to move my pc which is very inconvenient for me when trading but if I am in my laptop, I just need to move the pocket wifi anywhere to get the connection smooth again.
On the contrary, I also have a crappy internet here, but a pocket wifi usually suited me best when I do trading. But yes, I prefer my old laptop though, it is still functioning as it was design so I don't want to buy a new one because it is still comfortable to me.
I don't like trading with mobile, although there are a lot of big screen mobile phones, I don't feel relax using it specially if it involves money specially in our daily trading activity.