My first thirty five years were at Maine Road therefore in 2038 (and age 79) I'll have spent equal time at each stadium. I don't think you can ever forget your first match. My memories of Maine Road were the hotdog vans, the tiny souvenir shop and Tony Coleman running towards me as I stood above a tunnel in the corner of the scoreboard end. The 7-0 win against Burnley helped too. The Kippax in full flow was a sight to behold, so many matches to remember. The King's comeback, AC Milan getting thrashed, Everton cup tie, Schalke and Charlton 5-1's and another 5-1 that escapes me right now.
My son had his first match in the North Stand aged 3, later sitting in the pathetic Swales stand for a season then the Kippax when seating put in. He did however get to stand on the Kippax before standing removed, how he loved it. My grandson however has only known the Etihad (as at 3 years old he had no choice). His first match aged 9 months? 7-0 v. Rotherham.
However, time moves on and the Etihad is now our home and how well we're doing. To sum up, I cannot choose between the two