would choose Chinese firm MT because it's a permanent post 

You can jump back to the Japanese company later if you really don't feel right working there, coz overall it's contract-based 

Hello, agree中資bank MT無論係個package定path都promising好多嘅，雖然唔清楚日資果間係咩行業，但都聽人詬病過日資好多時一嚟hierarchy會較重，人工加幅亦冇咁好，亦相當重視life-time employment，即係expect一間公司做一世，但喺香港情況應該好啲嘅。不過就算係咁，都係應該以你個人嘅career performance行先，興趣同做得開唔開心，未必係高啲人工cover到嘅。Sorry都冇乜insight俾到你..