I must say, I'm most partial to the Gensler design for several reasons (something I never thought I'd say), mostly because I like the other two far less.
The Onni proposal could be saved by an expertly and dynamically designed facade system that evokes mid-century modernism, but that's a long shot, having seen the value-engineered facades of their other projects. Not so bad for a 20- or even 40-story building, but not so great at all for an 840-foot landmark tower.
The Handel design, honestly, looks like it was designed by CGI animators for Stark Enterprises.
It needs a lot of refinement, and while the green space facing out to 4th and Hill looks lovely, I don't like how there's literally a blank wall abutting the Angel's Flight track.
I know the Gensler design doesn't do a great job of embracing the AF either, but there's clearly a mindfulness of the activity nodes at the base, urban streetwalls, and the brown terracotta is going to do an excellent job of accenting both the older Bunker Hill office towers and the newer glass facades of recent constructions.
Also, anyone getting major pre-recession Park Fifth vibes from the Onni design?