TBH m8 doing a cut with roids there is no miricle drug or everyone would do it.Yes some roids will help keep muscle gains as when you do a cut you go into calorie deficit mode and carb deficit aswell so your weak and tired and your body starts to use muscles for energy source so you start to loose size but IMHO doing a cut properly you dont need roids just loads of cardio and a very lean diet
Popular roids used when people cut are like test,winny,tren to name a few and doses are lower than normal sometimes but again it all depends on cycle history etc
If your set on doing roids then try sust @ 500mg/week for 8-10 weeks along with lean diet and loads of cardio