I have to be honest if it was me I would probably go with the EK.
Simply because I have an Aquaaero 5 PRO and I have no idea whatsoever how to set it up. It came with no manual whatsoever and their website is in German only, Google tries to translate but it isn't always clear, and even then the website doesn't really tell you what to do.
So its fitted and has my radiator fans connected to it but other than feeding my fans their power it is useless. Apparantly you can do all sorts of cool stuff with it but im clueless. Aquasuite is also hugely confusing and again has no manual (you have to download that yourself, and find it).
I would guess that EK would be a little more helpful but then that would probably be naive...
Aquasuite is pretty intuitive to be fair, you dont even need to use it providing you have one of the controllers with the front attached

Though i wouldn't reccomend it, takes a kin' age!!!
Aquasuite 101:
Update firmware if you havernt.
Click on 'Aquero' move down to 'controller', 'X' out of all the defaults, hit the '+' sign in the top right and choose 'cruve controller' add your data source (temp sensor) add your fans you wish to control via the curve. Either manually select or automatically setup your curve.
My temp sensor is water temp
one of these.
Now setting up your fans so they come down in speed and up!

Underneath 'Controller' on the right hand side is 'Fan' select that, at the top will show you your fans, just select one and slide the 'minimum power' down to something, i choose 0, as it means my fans dont turn on till coolant temp gets to about 27c

Then they increase speed slowly, whilst browsing etc they run at 200-300rpm.