FOX is a $25b company with 10k employees with the main TV network and local stations as its main bread and butter. FOX Sports and to a lesser extent FOX News are (like their lesser known branch FOX Entertainment) all about driving viewership to FOX and the local affiliates.
FOX News, love them or hate them is a major player in cable news, FS1 is nowhere near that same status in sports. They are closer to CBS Sports Network or NBC Sports than it is to ESPN. They mainly compete with ESPN2.
As far as Disney is concerned they are a $200b company with over 200k employees. Igor split the business in 3 parts. Disney Entertainment, Disney Parks/Experiences/Cruises/Products, and ESPN.
The fact that they carved out ESPN and have talked it up as a primary revenue generating business means either they are about to leverage that business like crazy (streaming, betting, events, radio, news, etc) or that they are positioning it for a huge payday which still would be a positive for all involved.
If this is purely FOX vs Disney this is not even a competition. Disney eats FOX’s lunch. But add in CBS/NBC to go along with FOX and guarantee 3 OTA TV windows and that deal is impressive (which is what the B1G had to do, only getting 2 of the 3 wouldn’t have been nearly as impactful).
Still if your a fan of a conference in the next decade in a streamlined streaming world (minus some collaborative technology that allows you to easily flip between games) having all your conference content on a single streaming service is far superior.
Imagine Big Ten fans having to subscribe to whatever app FOX does, Peacock, and Paramount+ to see all their team’s home games while the SEC(and ACC) can just stay on a single app with great PIP/multi view options.
The Big Ten may have a slightly better money position and exposure currently, but long term I think the SEC hitched its wagon to the right horse.