As I reported previously, I also liked Dav's IDE, quite a bit, in fact. My only issue with it being that it was not up to date, in terms of functionality. What we might call now Fellippe's IDE is not only fully up to date, but when issues are discovered, the fixes come in fast and furious. To me, that trumps a lot of other considerations.
Also, I have to agree with the emotional/sentimental idea that the QB64 IDE ought to be written in QB64. I'm only unclear why a graphical IDE could not be written in QB64?