Quick question regarding 2018 status benefits: I'm SE and will select 50K status for my significant other because she flies enough to make it worthwhile for her but she would not earn it herself. Should I then go for 50 eupgrades or better 100% mile bonus?

My aim is to sit in longhaul business class as often as possible. At times I can directly buy C, otherwise I will PE and may try to upgrade to C with eupgrades or other means on the night flights if possible. I earn about 120k-150k status miles with AC so would get about another ~125k award miles with bonus compared to 50 eupgrades. What would you consider to be of more value?