Having stronger tie bars just means that you move the deformation to another place, I have some Uprated adjustable ones, mainly for the adjustable feature they pose, and when I had a little incident with a stump of a tree, it bent the place when it joins to the chassis instead.........
The standard tie bars are relatively cheep to replace so I'd stick with them unless you have gone adjustable to be able to change the castor / camber.
If however you are talking about the steering arms, then even 1" think pieces of steal will bend if you hit (have something hit you) something hard enough (DANNY).
Simon