In my opinion it really depends on your goal and experience level for the dosage. 500-750mg is not a huge difference but can be to someone who has side effect sensitivities. My timing for TestC is an injection every 3.5 days, i.e. Sunday morning, Wednesday evening. Then my chosen AI 24 hours post each injection.
Diet and training are going to be the leading factor in determining the success of reaching your desired goals.