Thanks to drtreelove and TheBushDoctor, they’re now only a saucerload

Question

What would be a good tool and how can I make sure the tree grows straight and has a good trunk?
These plants are relatively young. Should I wait or cut low branches (not nessisarily suckers) off? Professional plants look pruned in a way

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Answer 1

It this time: For the plant in the first photo, the grey pot, I would remove the lowest three branches. For the black pot, I would remove the lowest growth that is overtaking the main leader.

The grey pot has a long root coming out the bottom, indicating that it has been in the same pot for a long time and requires re-potting.