this is a personal opinion only
Primo: disadvantages
1) prostate problems when going over 400 mgr/week
2) high BP
3) eventually hairloss
4) best is (unless no sides are coming) to use Primo for max 8-9 weeks
5) HPTA gets surpressed hard
Primo: advantages:
1) shots can be taken once a week, or every 5 days
2) no kidney problems
3) no liver problems (although liver values can be a bit up, but you can get this from weightlifting alone)
Anavar: disadvantages
1) could sligthly alter liver values, which can easily be controlled (ALA, Tyler liver Detox, L-reduced Glutathione, Liv-52, and don't waste your money on milk tistle)
2) Var thins your blood, the more you take the thinner it gets, so nose bleeds do come and this has nothing to do with high BP
3) Good cholesterol goes down, bad cholesterol goes up
4) when doing high dosages kidney pain IS possible
5) HPTA gets surpressed, but not as hard as with Primo
Anavar: advantage
1) you can take this for months (myself 8 out of 9 months, Ulter around 18 months). I never went under 50 mgr (just in the beginning 40 mgr).
2) you loose fat in the abs area, so you look better
3) no shots to take, you can take the pills with you on a plain, it's harder to take injectables with you
4) when ordering from outside the country, seizure should not be a problem since no one can proof what is in it.
5) no hairloss or less change compared to Primo, Winny
6) you can take Ox EOD (like when doing 50 mgr/day, you take 100 mgr EOD). Results where just the same. But when taken with Creatine, best is to divide the dosage over the day.
7) you can find cheap Ox, you cannot find cheap Primo
8) no high BP
9) no prostate problems
Gains where better with Ox then with Primo.
Between 12-14 lbs (ho yes, you loose fat in the waist area so you can carry some extra pounds.)
Some restrictions: a heavy guy could have problems to gain anything from Ox since such a guy is used to heavy roid use.
Results are from my experience. Someone else can see things different.
When using BTG's or Spa's maybe less mgr/day are possible, since those human grade (for maximum absorption) will give you more benefit. But this has a price.