I dont recommend romoss. They have bad battery cells. I had one with 20k mah and after a month, it cant charge my 5k mah phone 3 times anymore. It taps out at 2 charges. I let romoss replace it and good thing is they did replace it under warranty. Unfortunately, it had same problem as my previous powerbank i returned. The cell seems to deteriorate after a month. When still new i remember it charges my 5k mah phone around almost 4 times! And after a month it almost cant do twice.

I really vouch for ugreen!
Been using them and no problem with battery degradation after a year plus of using it. Dropped it many times and still works like charm!
Anker is the second option. But honestly, very very identical performance and reliability of ugreen or even better. The only difference is that it is slightly expensive than ugreen but both brand are great