opening - In the Queen's Gambit Declined, why is 5.e3 so much more popular than 5.Nf3 after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7? - Chess Stack Exchange

To me it seems that both moves transpose into each other in almost all lines, so why is e3 so much more popular? Some statistics from the lichess masters database: e3: 3,289 games (72.5%) Nf3: 877

Queen's Gambit Declined: Modern Variation - Chess Openings

Chess Openings: What is the optimal move for black after: 1. e4 e5 2. Nf3 Nc6 3. d4? - Quora

Queen's Gambit, Lesson 46

Queen's Gambit Accepted: Opening Guide for White & Black

Queen's Gambit Declined - A repertoire for Black based on the Lasker Variation

2022 Candidates Tournament (Madrid, Spain) - The Chess Drum

Random] 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 (Queen's Gambit Declined Modern Variation) : r/chessopeningtheory

Queen's Gambit Accepted: 1.d4 d5 2.c4 dxc4 3.e3 Nf6 4.Bxc4 a6 5.Nf3 e6

Do you want to start playing the main lines after 1.d4 with White? - ChessBase India