So I went to the local bike shop today, had to google what LBS means

They had many bikes in the store but none of the ones that I was looking for. The person working there suggested that I should go with a mountain bike instead of hybrid. His reason was that mountain bikes are more sturdy and most people end up buying a mountain bike anyways. Any thoughts?

He did ask me to try a bike for sizing, and explained how to select the right size. He said every brand is slightly different therefore its better to try the brand first. How do you guys try a bike that is not available in store?

And they do not carry Trek brand.