In the past I've used (at different times):
- Cyp: The most frequent test I have used (usually part of all my cycles at relatively low dosage ... Now I'm even using it alone). It's my favorite by far because it's very effective and I can get it cheap.
- Prop: I didn't notice any difference than with cyp, but it hurt a bit more and I had to pay more for it.
- Sustanon: Man ... I got sust flu every 2nd injection ... the first was REALLY bad, so bad that I couldn't train for two days. After that it got better and I did get some good gains.
- Suspension: Personnally I think that it's a good way to go for maximum size and strength. You'll get more sides, more bloating, more aromatization and more pain at injection site though.