Birth control help please

Amber • Cosmetologist❤️ I give great hair🎀💇🏽💁🏽
Hello ladies! I need your help! 
I am wanting to get back on birth control and I am wanting your opinion on what IUD implant I should get. I have read that there are 4 different kinds and I want the best. I was on the depo shot 4 years ago and I gained LOTS of weight. When I first got on the shot I was 130 but a year later I was 175. From then on I have struggled so bad with trying to lose weight. I don't want to be on anything that will make me gain weight but I want to prevent from being pregnant. Me and my Wonderful fiancè have been together for 2 years tomorrow and I've had A pretty good bit of " come on period where are you?!" Moments. And with me still in cosmetology school I need to be on some form of birth control. 
Your advice would be highly appreciated! 😊