Brad, hardiness should be relatively similar to Chicago Hardy. Taste is also relatively similar, one could speculate that this is more a function of climate than variety. If I had to pick, however, I would say MBVS has the most fig-like taste, but the difference is not huge. MBVS is also supposedly more fruitful and a bit earlier ripening than Chicago Hardy. Personally, I have had very poor luck with CH, I've had one for ~10 years now and have only ever had a couple ripe fruit. In fact, I only recall it attempting to fruit two times!
I don't have much info on Hartford Hardy and Cape Cod Hardy. Although, the fruit of Hartford Hardy appears quite similar to HC and MBVS.
I've not been able to confirm, but I believe this may be the source tree for my Cape Cod Hardy: http://www.capecodtimes.com/article/20131001/NEWS/310010340
The figs look nearly identical to the few I got this fall. I would be curious to know how this tree is doing after the past two winters.