A lot depends on the type of decision, and especially on how much it affects others besides myself. If others are affected, I think they should be consulted.
I haven’t found lists of pros and cons to be helpful at all because they do not get to the heart of something. Numbers don’t mean anything. Just one good pro or con could be enough to swing the balance.
I do ask myself some questions that usually help:
1. Is it reversible or irreversible? An irreversible decision is much weightier. If you sell your car, you can’t take it back. If you cut your hair, it can grow out again.
2. If it is irreversible, it is a case where if you don’t do it now you can always do it later (quit your job, paint the house, sell your stock), or is it now-or-never (accept a position, get an abortion, volunteer for an assignment)?
3. What’s the worst that can happen if I do? What’s the worst that can happen if I don’t?
4. Short of the extreme (the worst that can happen), what are the consequences of each choice?
5. What yardstick am I using? For example, if I have a goal or purpose, does this choice take me toward that goal or away from it? If it is about well-being, does it add to or detract from my own well-being and that of others? If it has a cost, what is the worth of this relative to other things? Is it the best use of resources?
When I’ve thought of all the factors I can, I listen to my gut. If I go against my gut I am nearly always wrong. Once I know what my gut (instinct, intuition, heart) tells me, then I can make all the lists of reasons I need.
[Edit] You do have to know what your priorities are, or any decision is going to be unnecessarily hard.