Giroud completed his £13 million transfer from Montpellier on Tuesday after rejecting the chance to sign for the Champions League winners.
The in-demand 25-year-old prefers the set-up at Arsenal, including its French influence, and suspected Chelsea manager Roberto Di Matteo knew little about him.
"Why did I choose Arsenal rather than Chelsea?" Giroud told French newspaper L'Equipe. "Because it is a club I love and I thought it would be easier for my adaptation.
"Arsenal is a great club, the facilities are wonderful, but I feel it is a club that takes big care before signing a player, notably considering human values.
"There are French players. There is also Arsene Wenger who let me understand he really wanted me. Chelsea is very nice, it is a great club, but I am not convinced Di Matteo knows who I am."