Here's a thought:
I have two CT22s. One has the boom arm (no Garage) and stays in the shop. A Systainer 4 goes on top of it. I keep all of my Festool sandpaper, Toolie Tool, clamps, clamping elements and guide rail components (angle guide, stop blocks and rail connectors, for example) for the MFT's. 10 foot extension cord. Also keep my shop apron, dust mask and hearing protectors in it. The Systainer also keeps all this stuff relatively clean when I remember to close the lid. Also handy to place the TS75, Domino or sanders. Where the CT22 and boom arm go, so does all the stuff that I need close at hand. I've read other FOG posts that have other great ways to use the Systainer-On-Top (SOT)
The other CT22 has the Garage on it with the small set of cleaning tools snapped on top. The 22 is the utility player: it goes to on-site jobs, vacuums up stuff on the floor that the hose on the boom arm can't reach and cleans the floor of my Honda.
I'm not advocating purchasing two CT22's. What I'd like to say is that your choice of Systainer-On-Top (BeSOTted?) vs. Garage may depend upon projected/actual use.