Upload & Sell: On
Depends on the kind of landscapes you're doing, but if it were me, it would be that 16-35 for sure. One thing with landscapes, they don't all fit onto a single focal length and if you only have one lens, that lens better be a zoom.
And before anyone says it - no you can't always step back or step closer. Sometimes there are things like cliffs, rocks, rivers, lakes, brush, etc in the the way