Pre season match result is not really important for every teams because they want use any formation and give chance for new player adapt well with new teams. Its not depend with best formation using because many manager not priority have to win in pre season match. Actually for Arsenal, they have several new players from Kai Havertz and Declan Rice still need time for adapting with new teams although have experienced in Primer league competition.

Loss from Manchester United in pre season match give chance for Arteta have to solve which line get trouble, regarding last season Arsenal performance in Pre season match not quit well but in domestic league success lead 2nd position than Manchester United with impressive performance in Pre season match but difficult have top performance in domestic league.