Looking for a solution for sewer backup during heavy rains in Chicago. We've been hit hard this summer and have received varying opinions on Flood Control system vs. and Ejector Pump system and are confused as to which method is best to pursue. Flood Control is more expensive. We just disconnected our gutters from the ground as well. Any thoughts on Flood Control vs. installing an Ejector Pump?

Well for openers ejector pumps aren't used to control backups or floods. You're thinking about a sump pump system. I don't know what you mean when you refer to "Flood Control". Would you care to explain?

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sewer backup during heavy rains in Chicago

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Sounds like the city has storm and sewer lines combined.
If this were my call here's what I would do, I would install a backflow preventer, (see image) just before the cleanout. The upside to this is it will prevent sewage from backing up in your basement, The down side is that when it's closed you won't be able to flush or drain anything until it opens back up again
Along with the backflow prevented I endorse installing Flood Guards, (see image) on all floor drains. You can check them out at, Flood Guards For Floor Drains - check valves to prevent flooding
Good luck, Tom

Thank you for your response.

The backup is coming in through a lower level bathroom toilet and sink, primarily when the rains are extremely heavy. We do have a sump pump to service the sinks, laundry, etc. but that is on the opposite side of the basement. We were told that when this bathroom was put in, they should have implemented an ejector pump/pit. The Flood Control system I am referring to is something that is installed on the outside of the house to intercept the backup from the city line. There is a basin, pump and valve system to prevent the backup from getting into the house.

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We do have a sump pump to service the sinks, laundry, etc.

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Enough! Time to get together on terms. A sump pump has a pit that collects ground water and water seeping into your basement.
A ejector pump system has a tank that collects gray water and sewage. It then pumps it up to a sewer line above the floor line. What do you have in your place?
The only way to prevent outside sewage from backing up in your place would be to have a backflow preventer installed. Regards, Tom