upside
it'll last for ever (mostly) and doesn't need to be replaced so on a long term basis its cheaper than carpet
looks far better than carpet
easy to clean - just run a mop over it
scratching can be an issue, just make sure you get a good hard wearing outdoor varnish (gloss or matt)
mine cost about £35/ sq metre to buy - T&G planks, tightly fitted
carpet can cost way in excess of this once you include undelay, gripper etc - and you'll have to replace it periodically
downside
once its down its down - no lifting to lay cables after
it feels colder than carpet - but in reality, there is little or no heat loss difference