What condoms are the best for preventing pregnancy?

Any 1 U will use. Condoms go through rigorous testing and quality control. Any condom will prevent pregnancy if used appropriately and if it maintains it's integrity. If you are concerned, use condoms that purport to be a thicker condom. "thin" condoms may break easier. Unlubricated condoms may break easier. Too tight condoms may break easier. Partner help with using foam, film, suppositiory and other may help.
Condoms. Not the "cheapest;" but good quality ones that are used appropriately/correctly!

Related Questions

How helpful is a condom from preventing pregnancy?

Reliable. When used properly and exactly as directed, it is effective about 80-95% over time. It is certainly not the best method. Read more...

How effective are male condoms for preventing pregnancy?

Safe sex. When used properly condoms have a 2% failure rate for preventing pregnancy. In careless hands, condoms can have an 18% failure rate. So used properly, condoms are very effective , but not perfect. Any time you have sex, there is some risk associated with it. Adding spermicide, a diaphragm or the pill will of course further reduce pregnancy risk. Read more...

Apart from using a condom what are the other precautions for preventing pregnancy?

Lots. There are lots of different forms of birth control out there besides condoms. They include hormonal methods and even permanent sterilization. Hormonal contraception is very common and includes pills, patches, implants, vaginal rings, injections, and iuds. Speak with your doctor and decide which is best for you. Read more...

What is the effectiveness of using condoms and Plan B if condom breaks in preventing pregnancy?

Plan B. Plan b is about 80%+ effective in preventing an unwanted pregnancy provided you taking within a 72 hour window after unprotected intercourse. Read more...
Plan B. In addition to info already provided - plan B can reduced % of expected pregnancies by 95% if used within 24 hours of sexual intecourse. Read more...