When I first got into knives, I bought mostly 'combo' edges. I believed that since I knut had to be ready to cut whatever needed fixing, he should be prepared. I also know that wet, sandy rope is hard to deal with. Myerchin makes marlin spikes to help unknot such ropes, but many people just cut them.
After a year or two, I found that the combos didn't help me that much. The serrated part was good enough for rope, but the straight edge was very short. I started buying non-serrated blades, but to be fair, I bought a totally serrated Jot Singh Kalsa to see if that performed better. A lady friend of mine who was an apartment super needed a stout knife for rope and cardboard and really liked the total serration idea; I gave her the knife.
I have heard that a serrated knife seems to go longer between sharpenings. Probably true. But in the five years since I have bought my last serrated knife, I have not needed that type of aggressive cutting. We have a Gerber axe for really rough work outside. With the Edgepro, I can sharpen to a 'toothy' edge, and it seems to work just like a serrated knife. Besides, these new steels seem to go a long time between sharpening anyway.
I made the choice, no more serrations. That being said, if I bought a boat, I just might include a Myerchin or Cold Steel knife on board for the new opportunities or problems.