If you had to chose one i'd use nolva at 40mg's for 10days, 20mgs the next 10 and 10mgs the last 10days. Optimally nolva and clomid is best like this:
Day1 300mg Clomid 40mg nolva(day 1 is preffered by some and not by others)
Days 2-11 100mg clomid 20mg nolva
days 12-20 50mg clomid 10mg nolva
days 13-30 10mg nolva