there is no BC that is over 97% effective - if you were told something is 99.*% effective, then you were lied to. Condoms, most pills, and the Depo shot are all 97% effective. The main difference between them all is personal preference and how your body takes to it (some people have allergic reactions).
My personal preference is the Depo shot IF YOUR BODY CAN TAKE IT because 1) you only have to take the shot every 3 months 2) You will never forget to get that shot because your doctor will call and remind you 3) it is 97% effective, just like all the rest of things 4) No hassel of trying to remember a pill everyday or a stupid patch everyday 5) It will not get lost like pills will or come off your body like the patch will 6) You know your getting it done right becuase YUOU arent doing it, a Doctor is 7) No period or very little period 8) Moods swings lessen 9) Stomach cramps become absolete 10) No big hassel with stupid condom wrappers when trying to have sex 11) I HATE CONDOMS
I could keep going, but I am sure no one really cares anyway.
Condom/Pill/Depo -- They are all the same amount of effectiveness - 97%
Which would you prefer ? Its all about comfort and allergic reactions at this point with these three.