It's more about dosage and duration than type.
In other words, 10 mgs of var for a month is virtually side effect free. But 50 mgs for 2 months can cause serious problems with liver, kidneys, and LDl levels.
All stroids at effective levels will suppress and that includes var and Primo.
Mg per mg, I'd say Primo is the "cleanest" steroid. Tren is the dirtiest. Deca is the most supressive. And Halo and Drol are the most toxic.