I'm gonna throw this out there. Have a good look at the interior of the car you want to buy. The secret everyone keeps dancing around in the interior "update" that was done in mid 2018. The post update cars are referred to as 2018.5 and then 2019 or white needle cars. The gauges changed from a "red needle" gauge cluster to a white needle cluster. Also, there was an upgrade to the infotainment system. There are several strong opinions on here which design is better. My opinion is the early 2018s looked weird and like a chevy(not a compliment) while the 2018.5+ looked more clean, modern. The sideways numbers on the speedo and tach on the early 2018s drove me crazy.
You should get what makes you happy..but just wanted to make you aware of that change.
Here's an early 2018..note the red needles, binnacle gauges, the speedo/tach numbers wrap around the gauge. Some people claim the early 2018 infotainment system is less "buggy" ...don't know if that's true or not
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Here's a 2018.5, 2019 or white needle. The gauges are flat, no binnacle and white background. Also notice slightly different look to infotainment system.
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Good reference. I have not found many bugs with my red needle nor on Facebook group or here. Probably bc it's a more mature OS that's been tried and trued by GM for a while. The new Android based OS has been a consistent sore spot on Fbook group and here for various freezes, random reboots, and bugs. The silver lining is that the new OS will have a better chance of getting future updates/upgrades whereas the red needle OS is probably reaching EOL with only minor updates expected.