Congrats on your acceptances. I was deciding between both programs myself and will 99% be at SC.
As you said the connections at Marshall will pay dividends in the long run if you want to end up in California as I do. It was clear in visiting that Georgetown's student network is heavily mid-Atlantic, nearly every admit I met was from the area. I think Georgetown at the moment is a slightly better program but that's after SC took a major hit because of transitions in their career services office. They will undoubtedly rebound from it and I think hurdle ahead of Georgetown (just slightly again). Peer assessments (how other universities view the strength of your program) favor SC and I think that's a testament to the history of Marshall.
Let me again say that I like Georgetown a lot. Ultimately my (and it seems your) desire to stay in California sort of made the decision for me. While Georgetown did have a West Coast club, I think it was clear it wasn't substantial enough for me to feel like I'd for sure be employed in California following graduation. When you're battling the West Coast 4 (Stanford, CAL, UCLA, and USC) along with a huge pack of Top 20 schools that actively seek employment in California, it becomes tough.
Connections can make a huge difference, and regardless of its recent dip, I think SC edges out Georgetown if California is where you want to end up. I've mentioned on a few posts that I do strongly believe USC will be on the rise in coming years. They peaked at 19th not long ago and have a HUGE endowment. The university itself has undergone a huge transformation and eclipsed programs like UCLA in the National University US News Rankings. Marshall hasn't caught up to this progress but the university knows it's important that it does and is pushing a lot of resources into doing so. Marshall is its largest professional school.
Regardless of your choice, you're looking at two great programs that numerically are very similar. They're both friendly programs just outside the Top 20 that lack the ego you sometimes find with prestige. You really can't lose.
Good luck!