A matter of personal preference. I prefer the heavy plex. I hunt medium game such as deer and feral hogs. Some time coyotes, but not much. For me , for whatever reasopn, the heavy plex such as a German #4 or #8 draws me to intended target quickly ... and for sure in very low light is much more visable.
For small game such as squirrelas and rabbit, and taget the fine plex might be better. A heavy plex might cover up too much of the critter.