Join Date: Sep 2019
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2015 models had hesitation that was debatable between turbo lag and DCT transmission lag. The general opinion became transmission.
2016 modified the gearing to reduce the lag but we are still dealing with a small displacement motor and effectively a manual transmission.
In other words ... Expect some lag.
That being said, since you have driven a 2019 as well as the 2020 and you did not see a problem with the first, I would suspect some sort of a problem with the newer car.
Hopefully MB has not made changes (fuel economy and emissions can be driving forces in undesirable alterations) to diminish performance. But I yield to those who have driven a 2020 or may know more details.
Good luck with your decision.
There's a good deal of off-the-line lag in the 2018 GLA 250 as well. However, it does depend on the dynamic driving mode selected. In Sport mode, which raises the idle to help 'pre-spool' the turbo among other things, the lag is significantly reduced. Perhaps the 2019 you drove was in Sport mode and the 2020 in Eco/Comfort mode? A 'smart' salesperson will select Sport, and turn off auto start/stop, to best showcase the product.