Hi Felix, welcome!
There is not really a best way here. You’ll get all kinds of passionate answers. I’ll tell you what I chose and why. You’ll see the other replies and then you can decide what will work for you. I also have a reef tank by the way. Discus came first. Then I decided to try my hand at reef. A little over a year in on that one now. But I digress..
I had a community tank before the Discus and I had a canister filter. They work great. I have nothing against them. However my personality is... out of sight, out of mind. Those things can sure look clean on the outside!!!! On the inside, without regular maintenance they become nitrate factories. My poor community fish were the hardiest creatures ever. I knew I needed the Discus dirt to stare me in the face. I needed to be able to see the nasty stuff. Also knowing by the time you see it, it’s already too dirty. The sump is by far... for me... the easiest solution for filtration. You can just reach right in there. My tank is a 75 gallon cornerflow with a 20 gallon eshopps sump. I wouldn’t go with that brand again just by how it’s set up but it does the job. Others will have very good points on their methods. You will learn the pros and cons of each and be able to make an educated decision for your situation.
You can also check out the water works section. Should be tons of useful info there..
http://forum.simplydiscus.com/forumd...35-Water-Works
Read as much as you can. Years and years of experience in this forum. It’s the perfect place to be for learning and exchanging ideas about Discus and anything else under the sun.. Blue cheese, beer and cats seem to be popular lately...
You have the right attitude about patience. Good clean water and good stock will set you up for success.
Enjoy and welcome to this big crazy family!