Which is the best short-term contraceptive to use if i would like to try conceiving in a years time?

Varies: The "best" for anyone is whatever is determined after a good medical history, review of present health issues & meds and an understanding of how/why it is being used. An IUD requires little daily thought but is pricy. There are dozens of "pill" choices that may or may not work well with a particular person. In short, you find this out by working with a health professional over several months.