I will have to look-up more about manual but trying retopology for my human character has given me the impression that manual retopology is easier.
After having gone through the Automatic Retopo using Remesh and Modifiers I find that the manual way is actually better because it is cleaner. Less chaotic and thus less frustrating.
You simply extrude planes around your mesh fairly quickly and can connect them with Bridge Extrude.
It feels almost identical to the box modelling for the armour.
Perhaps though there are things to be done differently about it and I will have to look that up.