- So, what do you think of the application I finished yesterday? Would you correct anything?
- I support your idea, but the client would appreciate it more if it was completed by/with/using/via other software.
What is the best choice here and why?
I would go with using. Here are what I think are the problems with the other word choices:
I think it sounds correct and complete if you use:
I support your idea, but the client would appreciate it more if it was completed by using other software.
because you need both a preposition (by) and a verb (using).