For hand spears there are really only three ways to go for the pointy end…
The paralyzer… Which has three tines that spread apart as they enter the fish. Some have barbs but they are not really needed as the spreading action does a pretty good job of keeping the fish on. In the one pictured by Gat-Ku the tines are textured to help keep the fish on. If you are somewhere where you can spearfish for reef fish (IE NO Ciguatera) this head makes a lot of sense.
The flopper head is the one most people think of when they think spearfishing and fr the most part it is your mainstay as you can use it for Pelagic fish as well as reef fish. However, where hand spears are concerned this sort of head can put a lot of strain on the spear when spearing a big fish…
Which is where the “Slip-tip” comes in… The head comes off once you spear the fish and the resulting strain is taken up by the connecting cable. This Gat-Ku is the head I use for all blue water triggerless spearfishing.
More than likely you will want to have all of the various types on hand to better suit your conditions and the sort of prey you have in mind.