I would go Windows if you have the license..
A) you have paid for it..
~Hands
(here is the ubiquitous "donate" wallet ID 13d46unynPiuspsND1fC3kuPeb8szgWv4T)
Not required for initial mining. With rearming you have 120 days of legal use or for that matter download a Live VM from Microsoft for "testing" to get 30-60 days.