My friend’s laptop can get a strong connection with wireless internet signals that my laptop struggles to connect to at all, or drops after a few seconds. What is that feature called and how do I identify laptops for sale that have it?

I have 2 & need to carry both on board (don’t ask why). I have a medium sized luggage that I plan to put both laptops in there just so it looks like I only got 1 carry on. I was wondering if they will say anything about having 2 laptops?
I am not packing them into the checked in luggages to avoid damage (you know how they be throwing the luggages around). These 2 laptops are going into my hand carry bag which is a medium sized luggage. You are right about how it will take long at the security checks. I’d have to take both out & put it back in. If I have to do that to protect them both, then I will. It’s worth it. I don’t want them broken.