what is the best way to transfer data from Mac book pro 2014 to iMac 2015?

sima263 wrote:

How to transfer Data from Macbook pro to iMac

The most trouble free way to move to a new machine, is using the Setup Assistant on the initial boot— you have one shot here. https://support.apple.com/en-us/HT205749

If that opportunity has past, the second best way is use the Migration Assistant.

How to move your content to a new Mac https://support.apple.com/en-us/HT204350