In defense? we had evans, jones, smalling, ferdinand, vidic, rafael, evra and buttner. City had Kompany, nastasic, lescott, k toure, clichy, kolarov, richards, zabaleta, maicon and bridge, by my maths, use had 2 more defenders than we did. also had more keepers than we did, also had more strikers, we only had more in midfield so i don't understand where this 'depth' we had over use comes in.
I'm not just talking about numbers but also the quality of the reserve players.
We might have had more options at fullback but Richards and Maicon were out practically all season and Bridge wasn't even at the club. The heart of defense is where Utd had much better quality and more options. Rio, Vidic, Evans, Jones, Smalling is much better depthwise than Kompany, Nastasic, Lescott and a past it Kolo.
And even when Maicon was fit, which was hardly ever, Jones is much better and Smalling is certainly no worse at RB.
LB was pretty equal with Buttner and Kolarov. I don't know if you rate Buttner but I don't rate Kolarov, complete liability.
We couldn't really handle being without Kompany. Utd were better equipped to handle things without their best CB.
In CM we had Yaya, Barry and Garcia (utter tosh) and Rodwell but he was out all season.
AM our first choices are better but whilst Milner is pretty good the quality drops alarmingly with Sinclair. Utd had Kagawa, Valencia, Nani, Welbeck, Young to choose from, so more quality in depth
Upfront it's probably close either way. Both Dzeko and Chicharito score goals despite being quite poor in terms of linkup play. Balotelli was sold.
Whether you think City had a better squad as a whole really depends on how much more you rate our starting 11 over Utd's, imo. I think it's quite clear that Utd had better options outside of the first 11 overall.