If Xiaomi is considered a quality tech brand at low prices, Redmi is regarded as a similar brand at even lower prices. Of course, with lower smart features.
From Redmi 8A it is expected to be the best smartphone at a price below 100 usd. Even if he does not have a fingerprint sensor I expect him to rise to the level of expectations.
I remind you that Redmi 8 is provided with a 2GHz octa-core processor, RAM options up to 4GB and storage options up to 64GB. Redmi 8A should be a little less efficient.