Hi and congrats on your admits!
I see you have had a low profile on GMAT Club
Johnson and Darden are fantastic for iBanking. Johnson has made strong strides in that direction over the past 5-10 years, though most of that is actually happening in New York, Connecticut, Florida or East Coast basically.
Johnson does not report their geographic employment numbers but I would guess it is very similar to Darden with only about 10% going West. Part of the challenge is I am not sure how much hiring of fresh MBA happens into Corp Dev groups. I feel more of that may happen poaching people from McKinsey or iBanking firms. It may be that there is a steady pipeline but if there is, it is not very visible at Darden/Johnson.
As to rankings, I feel they are similar. Some years they are close and sometimes Darden is higher but I feel there is a tug of war and probably not meaningful difference. Both are fairly remote in small college towns and I feel the biggest surface difference is going to be the case study method for Darden. Many people really like that (and some really want to avoid it) so that is the first and easiest options to consider.
I would say a lot of your success after/during MBA will be luck and chance. You may have a classmate who used to work for Google or someone you meet on a flight works at Nvidia that will be complete chance and completely unrelated to which program you pursue, and completely impossible to foresee which one would give you the better edge. I feel Johnson has a bit more added value being Ivy League and better known internationally which may give more oomph for recruiting internationally if you ever decide to leave.
As to alum groups and networks, you are correct that connecting with the engineering school grads or undergrad alums will be less effective and sometimes awkward though you can make it work if that is the last resort.
I think both Schools have a lot to offer and it is a close call but I am very slightly leaning towards Johnson for its international reputation. Your co-workers would likely be more jealous of Cornell rather than Darden 😂