2.5mg of Rosuvastatin has similar effectiveness as 2mg of Pitavastatin but there is evidence that Pitavastatin has significantly less detrimental effect on blood glucose control than Rosuvastatin. Having reviewed all the statins, I think everyone should be on Pitavastatin unless they have some unusual specific intolerance to it.
You can get it in 1, 2 and 4mg doses. As a practical matter I buy 4mg tablets and split them in two for cost effectiveness.