I've seen both b5 and #4, but I use the #4 designation because it's the fourth that's altered, not the fifth (like in a lydian scale). I also use the #11 designation- to me that implies voicing the chord with both the fifth and the raised fourth.
The + has been used to indicate both "add" and "raised", and due to this confusion I don't use it at all (I use # or the word "add"). I also enclose the chord alterations in parentheses to avoid confusion, as in Db9 vs. D(b9). Without the enclosure, some might interpret that to be a Db chord.
Unfortunately there is not much consistency in jazz chord nomenclature. My choices are based on what I consider to be common practice in my circles of experience.