In many communities there is a regular weekday morning Minyan and the "working-person's" Minyan, which technically Davens too early according to most opinions, but which is better than nothing, according to other opinions. But, again, many opinions hold that it is far better to Daven "at the right time" all alone than "too early" with a Minyan. This is how my Rav in Yeshivah Paskened.
In a slight twist, I'd like to ask the following: If someone will have a slight chance of Davening alone at the proper time (Zeman), should he forgo Davening with a Minyan that definitely Davens too early? What if the odds are stacked against him that he will likely miss the Zeman anyway and have to Daven late or do Tashlumin (make-up)?