Before jumping into this comparison you should keep in mind that, just like everywhere else, the advertised prices are not the same as what you’ll pay. The “list” price doesn’t include taxes or fees. The prices will also vary wildly depending on what deal you get. Many ISPs offer cheaper packages that also offer you cable TV, landline, or 4G/5G phone services. These bundles are normally only for one or two years and require you to sign a contract. 
Finally, before talking specifics, always check to see if there’s a data cap. Today, thanks to work and school from home, video-conferencing, and 4K video streaming, many of us use more broadband than we ever had before. One TeraByte (TB) of data per month is indeed a lot, but it may be less than what you need in 2021.

Hidden fees and data caps

Take what I’ve told you here as a starting point. It’s a pain, but you really need to check out the available plans and take a long, hard look at hidden fees and data caps. All of these change at the drop of a Braves fly ball. 
The prices for the speed are hard to beat too:

Atlanta Google Fiber’s 1Gbps plan costs $70 a month, plus taxes and feesAtlanta Google Fiber’s 2Gbps plan starts at $100 per month, plus taxes and fees

You can also add home phone service for an additional $10 a month. Generally speaking:

300Mbps is $35 a month500Mbps is $45 a month940Mbps is $60 a month

To these, you can tack on additional taxes and equipment fees. You may sometimes see sites claiming that AT&T still offers DSL internet. That’s no longer the case. Beginning on October 1st, 2020, AT&T stopped offering DSL. Some existing DSL accounts are still being supported. But, AT&T will no longer offer it as a new service. Yomura gigabit fiber costs $99 a month.  Businesses may also want to talk to them about their 10Gbps service, which runs $999 a month. With this “Scary Fast internet” service, you still get up to 1Gbps speeds. Gigamonster prices, because its services come via apartment building owners and townhouse communities, vary. They are usually comparable to the otherGbps ISP prices. On the high side, 1.2Gbps, if available, will run you $106 a month if you agreed to autopay and e-billing. As usual, package deals may reduce your internet costs. Speeds and prices are: 

200Mbps starting at $50940Mbps for $110

I use, and like, the top-end of this service myself to the north of Atlanta in Asheville, NC.  Then, and only then, you will be able to make a smart internet decision. But, look at it this way, at least in Atlanta most of you actually will have choices to make. 
In most places, you’ve got no real choice at all.