200 moving average on 1 minute chart can be drawn differently depends on your data configuration

[Jason W 17]

I notice the chart would draw 200 moving average differently on 1 minute chart depends on your data configuration. 

As far as I understand it

The difference comes from that if we use 1 day minute chart, there will not be 200 bars before market opens. So the 200 moving average on 1 minute chart is only the average of first 150 bars. (Since pre-market opens at 7am) 

But if we data configure to more that 1 day minute chart, it will have enough 200 bars (150 today since 7am +50 from yesterday)

This differences will go away on 10:20am after 50 minutes of action.  

But Since 200 moving average is such a huge level, which configuration do we choose at the open ?