I would get those fittings for the commercial keg setup, so that you can easily swap between a corny keg and sanke keg without having to change lines/hoses. Just be sure to get the small plastic washers that go between the MFL male and female parts (so you don't leak due to metal on metal gaps).
Personally, I'm only drinking what I'm brewing. It's all going into keg now, and I don't intend to ever pick up a sanke keg of brew. I also don't intend to fill the sanke kegs I have now with finished beer to serve/dispense.
If you have a decent enough pipeline going, I would simply go for all to corny keg setup. You could always add a sanke coupler and those fittings later IF you start getting commercial kegs. Use the funds you would have spent on the sanke setup for other hardware, or ingredients.
On Tap: Caramel Ale, Mocha Porter II, MO SMaSH IPA Waiting/Carbonating: 12.5% Wee Honey II, 8.9% Old Ale, English Brown Ale, Lickah ESB, Mocha Porter II Fermenting K1: K2: Epic mead K3: TripSix On Deck: Caramel Ale Aging:mead Mead [bottled]:Oaked Wildflower Traditional, Mocha Madness, Blackberry Melomel, maple wine
I looked into the Sanky keg idea, most reviews or opinions I have seen say it is really not worth the hassle.
Most of those opinions or reviews are written by people who have never used sanke kegs for homebrew...those that have usually prefer them IME. I have never read a post about a leaking sanke keg dumping gallons in the bottom of a keezer...of course...YMMV