On PC, I'm not aware of it and ideally hard wire is the way to go always but with tri band technology and 5Ghz bands in routers which are mainly used for gaming and super high quality streaming from your home media system I think it should be better than what we had to deal with in the past.
I only do wireless gaming on PS4, with a shitty router and it's still much better than most PC games with a wired connection and higher speed anyway lol. Are you going to be gaming on PC or console btw? Since hard wiring for you is not possible, best is to start looking into best wireless option for your setup.
And yes, Router A and B would be the same as far as pings are concerned AFAIK. I merely suggested that if you have a mediocre Router A already, you can get another decent/mediocre router and connect both with each other to get some stability but for that you'd have to search a lot and tinker with settings a lot to get them both connected and what not so ideally it's just best to get a simple beefy and tri band router for ideal results oh and the distance also matters a lot .. if it's not much then a tri band router should do you good.