Entry & Exit points for NiftyBEES - should I plot the NiftyBEES data or the Nifty Index data

This is not for day trading but medium to long term buying & selling of the NiftyBEES ETF.

If is better for me to go through the NiftyBEES ETF chart or should I just look at the Nifty 50 index charts to determine entry & exit points?