Benefits of Tren A : Hits faster, clears out faster. You feel the effects quicker, and you can stop if you don't like the sides and it will leave your body faster than the longer ester.
Cons: Having to inject everyday or every other day. Grant it, volume injected on a daily basis is not high.
Benefits of Tren E : Having to inject less often, 1-2 x week. If you do test+tren E, that's just two days of the week you have to inject.
Cons: You have to wait longer to feel it, if you absolutely hate it, it will take longer to clear your system.
If testosterone is very low, you may not need any ancillaries. A lot of people see increased sides when testosterone is high. BP+Gyno seems to increase exponentially with higher testosterone dosages.
This is a powerful drug. Let diet and training do most of the work and you won't need a lot and will be happy with the results. The biggest problem with a lot of AAS users, they rely 90% on the drugs and when they stop seeing results in two weeks they scream "Plateau!! I need MOAR!!"
It's no surprise they shrink in 30 days once they stop.