In my opinion is better to have one strong team than 2 average teams...
You just need 11 players and one decent sub...other players are used for training to get +40%

Just have one squad...did you see any football team in the world playing matches with 2 squads ? Probably not

Also when next season starts you will need to train 22 players instead of 11 so no savings on greens here cuz if you for example have 400 greens you will spend 200 on each which so instead of one 7star team you will have 2 6stars teams...not good in my opinion...