Choosing a portable power solution for Raspberry Pi 5

Hello people, I was looking for a power supply for my raspberry pi 5. And I have two options I can either get a 5800mAh wifi router UPS with replaceable batteries (plus a step down buck to convert from 12V 2.5A to 5V 6A) or I can get a 10-20k mAh mobile phone power bank with 22.5w PD charging at around the same price. What do you recommend? As of now I just want to run an OS and build games for Linux, have no plans to connect power hungry peripherals yet, because I know very little and am only getting started but that might change in near future I understand power banks may not supply a stable current and I should ideally use a UPS, the UPS is also giving me an opportunity to use the pi at full potential. On the other hand I would have to buy a different adaptor for the UPS, make some modifications (to convert the voltage) whereas power banks are more plug and play and I can easily also use them with my phone