Something I saw online that was helpful and how I make my spruce trees is to start with a block with clear edges, like an ore block or polished granite/andesite etc and /replacenear when done. It helps get the general shape of a tree without having to fidget with logs.
Depending on the type of tree/leaves they can be a little better hand placed or better w/e'd in my opinion.
It kind of comes down to the type of tree tbh, but this ^ is what I used for mine.