Interesting discussion. At Bayern, Pep played sometimes with a very attacking 3-5-2 with wingers vs smaller sides. Like this:
Neuer
Lahm Boateng Alaba
Vidal Alonso Thiago
Robben Douglas Costa
Muller Lewandowski
I remember we lined up similar, but with 6 midfielders instead of 2 strikers vs Everton at home last season. Everton parked the bus big time, but it was one of our best performances of the season. It ended 1-1 with Stekelenburg having the game of his life, and 2 penalty misses from KDB and Aguero cost us the win.
Our problem last season was that we didnt have a good enough squad for us to be tactically flexible. Pep settled for the 4-3-3/4-1-4-1 as the players were more comfortable with it, and the results became more stable. This season he tried to play 3-5-2 in the beginning but since Watford away he has again settled with the 4-3-3. Now that the squad has worked with Pep for longer, i believe we will see something similar at home vs a lower table side:
Ederson
Walker Stones Otamendi
KDB Dinho Silva
Sterling Sane
Jesus Aguero
I expect us to play 4-3-3 vs United though.