Unless an abundance of internal storage is a priority for you, 256GB should be enough. An octa core processor makes sure your apps will run without any lag.
From Amazon
ASUS Zenfone 11 Ultra, UK Official, Eternal Black, 12GB RAM 256GB Storage, Snapdragon 8 Gen 3, 6.78 Inch AMOLED 144Hz, 50MP Gimbal Camera
Conrad Electronic
Asus Zenfone 11 Ultra 5G smartphone 256 GB 17.2 cm (6.78 inch) Black Android™ 14 Dual SIM
Custom PC IE
ASUS Zenfone 11 Ultra 256GB 12RAM 5G black