Unless an abundance of internal storage is a priority for you, 32GB should be enough. This model packs some great hardware with a 2 GHz octa core processor.
From Amazon
Samsung Galaxy A21s SM-A217F 16.5 cm (6.5") 3 GB 32 GB Dual SIM 4G Blue Android 10.0 5000 mAh SAM SM A 217 GAL A21 BLUE, 16.5 cm (6.5"), 3 GB, 32 GB, 48 MP, Android 10.0, Blue
OnBuy
(White) Samsung Galaxy A21s Dual Sim | 32GB | 3GB RAM