Nothing wrong with mono as for decades, that's all there was. I've found that Maxima is the very best mono. Slightly smaller diameter. Then, P Line came out with Co polomar which was even better. I prefer it over mono. I now use Floro for everything unless I'm fishing the surface and need my line to float but, after using floro and braid, mono is like fishing with a rubber band. You need a stiffer rod. Most of these deep crankbaits now go plenty deep with any line but if you are looking for maximum depth from a particular bait, use floro- 10-12#. Floro still has some stretch which is desirable for surging fish near the boat. So far the best floro I've used is Sunline Crank FC. It has a little more stretch for hard strikes while using any moving hard bait. One thing to remember tho- one backlash or fold over of floro line and its toast. It will eventually break. This line revolution is too expensive for me so I look for clearance specials. Otherwise it's P Line Co polomar. There are so many lines and opinions out there whenever you get confused, just go to youtube and always just do whatever KVD does. He's the crankbait king.