There are only 2 Halachic instances, where Davening BiYechidus supersedes Davening with a Minyan:-
1) If one is about to embark on a long distance trip, even if he will arrive at the destination in time for that same Tefiloh, and be able to get to a Minyan at his destination, he should still pray that service prior to embarking on this trip, even though BiYechidus [assuming he cannot get to a Minyan before embarking on that trip].
2) Mincha MUST be prayed before sunset:- Period!!!!! Even if this entails davening Mincha before sunset BiYechidus verses davening Mincha after sunset with a Minyan. The Mishnoh Beruroh is so emphatic about this Halocho, that there is simply no way around this one.
Just about every other situation, falls aside in deference to Davening with a Minyan. This includes:-
Vasikin BiYechidus verses a Minyan later [but before 1/3 of the day]
Early Maariv with a Minyan verses Maariv BiZemano biYechidus
Schacharis before sunrise with a Minyan verses shacharis after sunrise biYechidus
Mincha on Friday Chanukah before candle lighting biYechidus verses after Chanukah candle lighting with a Minyan
In all of these situations a Minyan overrides the other preference.
Even Tartei deSasrei with Mincha & Maariv at a Minyan overrides davening them BiYechidus at different time frames.