Japanese, Kana to romaji. What do you prefer?

So many different ways, it would be nice if there was an official way, romaji is such fail

1を
A)o or B)wo
2ー from katakana
A)- B)nothing C)double vowel

Now I know for things like し and しょ are usually written as shi and sho, but is it just me or am I seeing of si and syo pop up more often than it usually does? Maybe it's from more professional things though, e.g. mainichi issyo ps3 download game

here's what i found

http://en.wikipedia.org/wiki/Kunrei-shiki_R%C5%8Dmaji
http://en.wikipedia.org/wiki/Hepburn_romanization