Throughput is generally measured in the fraction of CPU cycles spent on GCing. The Parallel Old Gen collector is more efficient in that regard (i.e. provides more compute-throughput) than CMS, Zing or G1, but it is not concurrent and thus you have longer STW pauses compare to the latter collectors.

The concurrent collectors trade some throughput for latency by occupying additional threads for concurrent work. Due to the additional synchronization actions (more atomic instructions, read/write barriers, additional cleanups during shorter STW pauses) they are less efficient in overall CPU cycles spent.

So it certainly is a tradeoff.

Of course a collector that can burn more memory bandwidth and CPU cycles will generally lead to lower pause times, so in that sense increasing throughput of the collector is good for latency. But increasing the collector's throughput leaves less resources for your actual application, decreasing effective throughput.