First decide what you want to get out of the tree, where do you want to take it. Only then can you decide whether to prune, and what.
Pruning:
Maintenance prune (trimming growth away that does not fit the existings canopy). Always let a branch grow out a couple of leaves before pruning back: Growth is required to stay healthy. I personally do this whenever it fits me, with whichever tools I have at hand
Styling pruning in order to get the tree into a specific style. You may have to remove complete branches. Timing is crucial, and species-specific. I have no experience with eiter of your species.
If these were mine, I would probably change the trees quite drastically, so I would be the wrong person to ask for maintenance trims..