Best step in post

What is the most cost efficient step in post out there? We have been using the $2 ones from Tractor supply but would like to try a better wuality one as these only last about 1 yr before bending to the point of being useless.What other ones do you like? And what is the expected lifespan of them?

PS we are rotating goats, so they have to have multiple attachment points for at least 3 strands of wire.

i just use the metal T posts and wire attachments, they pull up pretty easy.