Steel is better - Border Patrol will be able to see through to Mexican side - otherwise, they’d be blind of what might be attempting to break through.
POTUS should have had the border patrol commander and union chief sitting next to him. Then he could have hammered the Democrats for refusing to give “law enforcement” what they need. The Dims are trying to use their Alinsky tactics and isolate POTUS. Trump needs to make it clear this border/wall/fence/barrier is what LAW ENFORCEMENT wants.
STEEL SUCKS
Steel is bad Engineering because steel BENDS with a simple hydraulic tool.
Concrete and rebar are strong.
See through steel comes LATER as a visibility second layer for border patrol.