Hi there Stormy! My name is nimpy, and I first joined around 2015-2016! I, like you, took a long break because of school/work. I am back now though! It has been a great time so far! I have met so many amazing people, and the Mineplex community is an amazing place to re-immerse yourself into the world of Minecraft! There have been quite a few changes in the past few years, so as Drizzerd stated above, you should definitely review the rules @ mineplex.com/rules Besides that, if you have any questions, feel free to start a conversation with me, and I am glad to hear that you're back!
It's good to see you back after a break! I started Mineplex in 2014 and rejoined in 2016. As for your question, I don't think either Java or Bedrock is better - it really depends on your preference. Bedrock is more easily accessible since it can be played on multiple devices, but Java's super fun to play if you have access to a computer. Me personally, I've been playing Java longer than Bedrock, but I enjoy both platforms a lot. It really comes down to what your preferences are.