which on is better-ODS/INFOCUBE for reporting

Hello expert's

1.I want to know which one ODS or INFOCUBES are better (technically/functionally) for reporting purpose in BW.if some one is having any comparisons on ODS/INFOCUBE then plz pass on to me.

2.Are Z tables reliable in case of data updation and fetching when we create ODS/INFOCUBE.

3.HOW RELIABLE THE "Z"(*TABLES/REPORTS) are in SAP-BW/R/3-ABAP.