Fina - cheap, homemade, above average toxitity and sides (safe opinion although many would agrue that it is more toxic), explosive results makes you very strong and ripped, frequent injections
Primo - expensive, high grade, very low tox. and sides, moderate results unless used in higher dosages, infrequent injections (not ED or EOD).
Not exactly an apples to apples comparison. Which one fits your goals and what do you want in your body.