Hi Mike, yeah so boolean difference is kind of like an automated "batch mode" of Trimming.

It basically does the same basic kind of job as trimming but in fewer steps because it keeps things as solids so any 2D curves that you use to cut the solid will leave behind their "side walls" and so you won't have to do any extra work to construct those separately.

So it can often save quite a bit of time overall if you work more with solids and try to use booleans when possible to do most of the work rather than only using Trim - Trim is kind of more "low level" and can help with some more difficult situations like when you're trying to repair a surface or replace just one small area of an object or things like that.

But for the basic main construction work try to stay more in the area of booleans and solids, it just tends to go quicker.

- Michael