DA -> utilt is amazing, great damage racker. I forget how much but it's a lot for just 2 moves.
It does 18 damage (7 then 11)
Warpstatus and I were talking about this, and I later talked with sfp about it: If you get a dsmash and are not in KO range, there isn't much reason to use fair after the second dsmash. DA to utilt does more damage and has less of a chance of you missing (fair sometimes can be difficult to combo both hits). Utilt also sends them at a better angle to setup our juggle traps. ***more on this at the end of the post***
Also, fair is not even guaranteed at low percents after 2 dsmashes, because they pop out more quickly at those percents, and therefor you don't have enough time to SH fair. DA to utilt is your best option here as well.
Really, unless your opponent is in kill range, or unless you really want to knock them out far away from you, don't use fair out of dsmash.
***SFP pointed out that at low percents opponents hit by utilt are often close enough that the ending lag of utilt becomes problematic. Here's how this situation usually has turned out for me.
I utilt. They see that they are still close to me, and usually attempt a dair (or nair if applicable). I shield, then utilt them again.
They've learned and this time they will most likely AD and attempt to DI away and land. You can wait to punish the AD with uair, wait for them to land then grab them, or use super mindgames and empty SH into a grab.
They can always jump out of the utilt, even though most people don't do this. If they do, you're in an even better position, because now that they've used their second jump their options are even more limited. They can either land on stage, where you can grab them out of their land, try and attack a ZSS from above (we all know how this one goes heheh), or they can go for the edge, in which case you are now at an even bigger advantage as their options are severely limited on the ledge against us.
You are in a great position in this case, because 90% of opponents that I've seen act the same way. You are in perfect control when you're close enough to threaten but not close enough for them to hit you; after that all it takes is a little prediction and knowing your opponent's options as well as your own.
Wow I didn't think this would be such a long post. Let me know what you think.