I had the raised style. It worked fine for the chickens. It did NOT for me.
I converted a shed into my coop and use poop boards and would never consider going back to raised floor.
If you build your run as predator proof as your coop you can leave the pop door open 24/7.
You also need to...
Hello and welcome to BYC! :frow Glad you joined.
Well ventilated, DRY coop with poop boards that are cleaned daily and dumped into a compost bin when full.
I recommend a walk-in style coop.