Personally most people I know who have had the implanton have gone back to the pill.
Implanton can cause irregular bleeding and I know someone who's doctor put it it wrong so its been moved and now its difficult to get out.
IUDs usually aren't suggested for young people and did cause problems a while back, my mums friend took years and IVF attempts to get pregnant.
I'm on the pill and provided you have a decent memory and no medical reasons why you cant take it its pretty good. Unlike the implant you can choose when and if to skip periods and you can stop it quite easy.
Its really quite easy provided you listen to your doctor AND READ THE INSTRUCTIONS. All you have to do is pick a time you easily remember i.e. breakfast or bed time or something and take it everyday then. I take mine at 8:30am because I am almost always awake and if I am out, just have it in my hand bag and take it then.
Most pills are relatively cheap.
Mine for example is Microgynon 30ED/Levlen ED
The brand name one is Microgynon 30ED and is something like $30 for four months supply but I get the generic brand Levlen ED which is like $17.00 for a four months supply.
Things to remember with the pill:
1. Read the instructions
2. Take it everyday
3. If you forget/throw up etc.. make sure you read the instructions and use a condom until the pack says you should
4. Always tell the doctor you are on it so they can check if it will reduce the effect or have its effect reduced by other medicines.
5. If it doubt ask
6. Tell you doctor about any other medicines or medical problems you have
The packets make it simple.
http://upload.wikimedia.org/wikipedia/commons/f/f5/Pillpacketopen.jpg
Look at that packet ok. Here the person started the packet on a Wednesday in the green section, then all you need to do is follow the arrows on the packet until its done then start the next one
The instructions explain it all and a good doctor should be able to reassure you and help you out with any questions.