Depends on what I use.
My Test/Tren/Anavar cycle, I didn't keep them all, but the muscular loss wasn't nearly as bad as trying to keep the fat off.
When I used Dbol/Deca/Test, I lost half of them simply because I couldn't lift the same amount of weight, and when I tried, I couldn't do nearly as many reps.
Also, you can't eat as much off cycle, which causes your muscles to suffer.
But... I kept all my gains from gH and PGCL. PGCL isn't talked about a lot on this board for some reason. But I kept 100% of my gains from it and personally feel it's the best thing to use. Problem is you can't do a 9-5 job and go through every day there with the sides