I've been playing dorf fort for a long time now but I could never decide if the resource expensive alternative of building a fortress out in the open for the esthetic and more flexible playstyle (pyramid, vanilla fort, segmented) is better or emptying the inside of a mountain for ease of use and very efficient resource usage is better even though it's a more rigid playstyle.

I know it is mostly an opinionated question but let's be honest, there are a hundred ways to play the game so except for the core mechanics themselves everything is an opinion, please don't flag this I am honestly looking for a breakdown of someone more knowledgeable than myself.

please provide your start strategies when you answer, thanks!

I've been playing Dwarf Fortress for a long time now but I never know how to decide if building a fortress out in the open is worth the higher resource cost.

What are the pros and cons of each method?