A lot of it depends on the soil you have to work with. Here in the PacNW I find the best trees in bogs or marshes which are mostly decomposed plant matter and mud. Getting enough roots is more about how far out do you want to dig. While it’s hard to get an actual “root ball” with intact dirt, it’s kind of impossible to bare root the tree because they’re all covered in thick mud. Conifers are definitely more challenging and require more care with the shovel and trying to get enough “soil” to keep the roots as covered as possible. But the elongating species I have access to (Thuja and Tsuga mostly) are very hardy and can handle a lot. Deciduous I pretty much just dig them out with a machete and they’re fine. I’ve even used a sawsall on big roots, no problem.