Actually, going by net rating for lineups used over 25 minutes this season, our best lineup by a longshot is a small ball lineup of:
Schroder, Smart, JRich, Tatum and Timelord. 39 minutes played +45.5 net rating.
The starting lineup of:
Smart, Brown, Tatum, Horford Timelord. 87 minutes played. +20.6 net rating
At over 20 minutes played two great lineups have been:
Smart, Brown, Tatum, Grant, Timelord. 22 minutes played. +35.3 net rating
Smart, Langford, JRich, Tatum, Horford. 21 minutes. +32.8 net rating
The rest of the lineups have too little minutes played to be considered, IMO.
So, there is proof that both small and 2 big lineups can be highly successful, depending upon who is in each lineup