That's great news carolbee, it won't hurt to leave the laptop on either network, if you're doing a lot of streaming of 1080p or higher content it will probably take the load off the slower 2.4ghz band by connecting to the 5ghz network, in practice though I've found the 2.4ghz network to have better, albeit slower coverage using a HG659 but that totally depends on your premises.
Do some experimenting with individual devices by connecting to both networks one at a time and do a walk around your home to see what coverage is better. For general browsing and social media etc I doubt you'll notice a difference between bands. Good luck
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