I would be afraid the eheim would be way to strong for a 120. I personally would go with a fx6 and some pothos. I have a fx6 and the only time I hear it is when it turns off and spits out any air that’s caught inside every 12 hours.
If you do get the eheimthen pleased do post pictures of the monster.
Personally I have had MUCH better experiences with my Eheim canisters than the Fluval filters I have owned. For me the maintenance on my Eheims have been easier, they are easier to get back together and I have never had a problem with leaks. I know others prefer the Fluvals. I have given up on canisters altogether since switching to sumps... I do keep an Eheim on the shelf though, the Fluvals were given away.
I've got both and would choose the Eheim. I even put a 1/8" piece of sorbothane under the pump and its super silent, just like my 2217. hell, even without it I still had to put my head inside the cabinet to hear it barely hum. Its a big pump on top.
Holds a ton of whatever media you want (just fill a couple large media bags and throw em in there). literally a 5 gallon bucket with a pump on the top. I run my 2262s with a 300w Hydor in-line and a single 5/8" loc-line output on my 150 (48x30x24) and 180, its definitely not too much flow at all.
I like the bottom up design better as well. pump stays protected from sand and debris.
I'm not a big fan of all the Eheim intake/output setup either, so I drill the backs of my tanks for the canisters.