Go for the A41 I'd say it absolutely is worth the extra money. You get more RAM, a better processor, and the 1080 x 2400 AMOLED screen will look better than the A20e's 720 x 1560 resolution.
Could be an issue with the charger itself. You'll also want to confirm if it is a software issue or not Start your S20 in safe mode and see if it wirelessly charges or not.