I heart them both, but only in my speaker based system.
They are complete opposites: the Stagedac is a very detailed sounding DAC with incredible depth and deep dep bass.
In contrast in the Havana soundstage placement is less determined in the depth and lateral plane (speaker based!) but gives a very natural pleasant sound. Bas is also very good, but less defined.
Tha Havana is much warmer, the Stagedac had a leaner more analytical sound.
I loved the way the Stagedac presented electronic music but I prefer the tonal colors of the Havana, expecially on (semi) acoustic music.
I've to add that I'm one of those persons that always had a problem with digital sound, and I could never find an affordable CDP I could enjoy (except the Rega Apollo).
So for me the Havana is perfect, finally digital sound without that annoying digital edge, so that is the one I chose.
But both are very good DACs IMO, and others might have different tastes.
the Havana has the possibility to roll tubes, the Stagedac has some nice extra's for HP-listeners, crossfeed and RCA with and without colume control, plus extra flexibility with all kids of settings (though in my system the differences weren't big, that will probably be different in HP-based systems).