I have a time series model that forecast next K days. For example when I forecast next 50 days my MAPE is 20.3% and RMSE is 2943 and when I forecast next 200 days is the MAPE is 10.25 % but RMSE is 9872. If I want to describe in a word which one is a better forecast the next 50 days or the next 200 days, how can I compare the MAPE and RMSE scores given this model?
For next 50 days range of outputs is smaller so it makes sense that RMSE is smaller and the same thing goes for 200 days since numbers are bigger therefore 200 days have larger RMSE however does this mean that model predict longer horizon better than shorter one?
Is there any other metrics I should take into consideration before making final decisions.
I have looked at this post but I still need more explanations: