Sustanon is a combination of hormones with short, medium, and long esters. Because of the short esters, unless you want a rollercoaster/up and down effect on your hormones it’s best to inject it EOD.
EQ has a long half life: 14 days. This means that two weeks after you inject EQ you still have half of it left circulating in your body.
Here is a chart that shows a typical dosing schedule for the different steroids:
I prefer to inject with equal distribution. If I run a short ester like test prop with EQ, I’ll still inject EQ EOD along with the test prop. No sense in complicating things.