Usage of pipeline bridge and clock crossing bridge

There is no easy answer to the question. Each bridge serves a different purpose so I would only add them when needed. For example if you have the clock crossing bridge in your system and you are having troubles meeting timing between the bridge and other masters in the system then it might make sense to insert the pipeline bridge. Keep in mind that as you add in these bridges the latency of the accesses downstream from the bridges will also increase so you need to carefully examine your system to determine what frequencies *and* latencies make sense for your design.