very broad question!
In general I've encoutnered a lot more coding on the BPS side, but that's really due to the nature of the projects which have demanded a great deal of highly complex modelling - whilst on the BW side extractorions etc often have some delivered content as a starting point a lot of the modelling logic must be coded from scratch.
FOX is quite a versatile tool, by properly setting the fields to be changed and condition paramters of the FOX funtion you are able to deliver custom functionality with a tiny fraction of the coding effort - for example to copy one key figure to another is achieved in a single line of code. It has its limitations though and ABAP exits are typically much more efficient for larger processing tasks.
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