Hi Wilber, it's been "hashed" over many times on here. I use 8# test for everything. I use the Hj Vis yellow or green. I used to use 4#test, then moved up to 6, and now I'm at 8. I troll a lot and get snagged quite often in brush, logs, etc. I seem to loose less cranks with the 8# and if I get a Pike or Walleye I have a little bit heavier line to work with. Spring time gills 4#