My point is the size of the crew. You want as many carriers as you can, each with a good length for take off and landing. The number and kind of aircraft depend on the purpose of your navy. I don't think any country will repeat the size of the US carriers, ever. So a 40k carrier with a tricat configuration and a length of 300 meters looks attractive to me. It won't be able to attack Afghanistan or Uganda but would help in defence of your other ships.