Given the choice I prefer raster charts. They display much faster. More important, cartographers have worked for decades deciding what information you will need at hand when you look at a feature on the chart. That's why raster charts show the vertical clearance of a bridge and the depth
of a wreck, for example. With vector charts there are many features where you have to do an object query to get the information you need.
Vector charts were touted early on as offering the advantage that the chart plotter could be cognizant of the depths along your route
. If you entered the draft
of your vessel the program could warn you if you had plotted a route
that was dangerous. Unfortunately, that feature hasn't been implemented in OpenCPN
or any other ECDIS that I've seen. Until it is implemented the only reason to use vector charts in preference to raster charts is that raster charts are unavailable for the region you are navigating.