Can a Fatbike Truly Handle Any Terrain with Comfort and Control?

Last Saturday I went to a trail with my friend. He was riding a fatbike on rough ground. The wide tires looked strong. That moment made me curious about fatbikes. I visited a local cycle shop. They had only a few bikes. Some were normal and some weak. I wanted strong stable and durable bikes. Local stores could not provide many options to compare tire size frame or quality. I wanted something good for rough paths. While scrolling many online marketplaces including alibaba I found many fatbike options. Some were simple and some advanced. There were different sizes designs and prices. I could compare stability durability and cost easily. Online stores offered far more variety than local shops and helped me explore better choices. Now I am thinking is it better to buy fatbikes online for more variety or visit local stores to test them first?