Efficient way to request two types of ways + relations from bounding box?

If I want to search for the ways and relations of highways and buildings within a bounding box, is this the most efficient way to write that query?

"[out:xml];(way[highway]({bbox});way[building]({bbox}););(._;>;);out;"

Or is there a more efficient way to specify the bounding box and the ways/relations I want within it? I'm using https://lz4.overpass-api.de/api/interpreter

Thanks for taking the time.

edit

To add some more context, we have an application where a user can toggle buildings, roads, railways...etc. So I need to be able to programatically peice together the query. So we get variations like:

"[out:xml];(way[railway]({bbox});way[building]({bbox}););(._;>;);out;"
"[out:xml];(way[highway]({bbox});way[building]({bbox}););(._;>;);out;"
"[out:xml];(way[building]({bbox}););(._;>;);out;"