I would go for fried or boiled...thats a matter of personal taste and preference, I have no clue which is the most healthy. I guess fried may not be very healthy but...oh well, I like it.
I absolutely love eggs. During the week, I'll be good and eat boiled eggs. For every 4 thatI eat, I'll eat only one yolk. But about once a month I'll treat myself to eggs the way my Dad used to make them....fried in bacon grease.