Pick the one that your most comfortable using. They all are able to provide sufficient estrogen levels and that's what's important. I like pills because I just take mine once a day. Some people like injections because they only do it once a week. Other like patches because they stick them on and only worry about them a couple of times a week. If you don't like needles, then pick one of the other two. Last but not least, if implants are available you only need to worry about them once every 6 months or so.
Development comes down to your genetics. My body didn't respond fast but others bloom out in as little as a year. While estradiol levels are some what of a factor, genetics is the most important factor in determining how you will develop. I will never be bigger than a B cup while other on the site have reached DD cup. Just sit back and enjoy the ride where ever it takes you.