I have both, the sddd101 is more convenient in the number of bits it has, but the small hex tube adapter being made out of sheetmetal is a little flimsy. I wouldn't use it for an everything driver, but I do have one in my car, it just makes sense in there.
I find the sddd41 to be more stout, but as jjj stated above, for $20 roughly for either, you can't go wrong, especially since they're both USA.