If we hadn't weighed up the advantages & disadvantages of merging the companies we would have risked making a huge loss.
I'd weigh the pros and cons up firstly before making any radical decisions!
If the cons outweigh the pros, we'll re-assess what the next course of action is.
We'd better weigh up the pros and cons in order to figure out what steps to take.
*To outweigh: To be greater or more important than something else.