The Drum Machine switch definitely feels a bit more stable. Has rubber on the bottom also. Switch spacing is less than the FC spacing. I have bigger work type boots on and can hit each switch ok. Spacing is wider on the other switch box, but that one is less sturdy.
For both of these, I had to set the 'reverse' polarity option for things to function the way you would expect for tap and hold. After that was resolved, works great!
The profile is low enough on the Drum Machine box that it may work sitting right in front of the FC. Here are some pics of various arrangements. (The FC-6 is someone else's I'm helping setup). Honestly my biggest challenge now is there are too many options!!! I suppose if I'm only using two expression pedals, I could add two more switches using the unused pedal jacks also.
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