Long story.
Years ago the doc prescribed me test cypionate.
Then they gave me cyp + eth and told me to blend them (not sure why).
For some reason, I seemed to like the eth better (yeah, I know, test is test).
But then another HRT doc was just convinced that eth was poison (she was also a nutty naturpath-something too). So I switched back to cyp.
And now I use cyp just because it was the last thing I used.