The major differences between JPT and Raycus has to do with the pulse width and the frequency available for each.
Generally speaking a JPT source will allow more control over the beam and allow for whiter whites on aluminum, darker blacks on steels, and brighter colors on plastics. If the goal is to have brighter colors on polymers or have darker colors on steels than a JPT is well worth the upgrade.
If you simply want to dig into metal with an engrave, or just do some simple names on tools, either is a great option.