I can't say i'f be disappointed if we get Bastian; however, if its a choice out of him and Schneiderlin, then i'd prefer Schneiderlin. He's younger, EPL proven, arguably better defensively (what we need) and he's a player I feel we can take to the next level, whereas Bastian won't, as he's probably past his prime.
Having said that, Bastian will guarantee us experience, and he's proven at the top, top level. He will also slot into that number 6 role when if/when Carrick is injured/rested. Other than that, he can also play the box to box role. The only thing I worry about is that in that last couple of seasons, Bastian, like Carrick, has struggled with a few injuries.
Maybe we'll get both, Bastian and Schneiderlin, although I personally feel we only need one of them.