Two different beasts altogether, that's for sure.
I use the Baum both on the turbo and on the road (these days I'm training on the turbo during the week and take it outside during the weekend for the longer rides)
Still absolutely love the bike which is quite exceptional for me after 3 years. ;)
I guess IF I would ever decide to go for a power pedal (Speedplay) I'd change the groupset to a Super Record one. I love the design of that crankset and I prefer the ergopower levers of the SR over the closed RE ones. For now, I'll keep using the Power 2 Max.
I'm not too happy with the Silca bottle cages on the Mosaic, they're more flexy than the King cage and they only allow certain bolts to be used. If you use regular bolts, the bottle touches them. I've now ordered some new bolts to see if that brings any improvement. If not, I'll swap the cages with the ones on the Baum. That'll leave me with 3 matching King's on the Mosaic and matching Silca's on the Baum.
I finally found and ordered a bolt on top tube bag, will come in a mix of coyote and forest green. I've also ordered a Thomson seatpost to "replace" the ti post. The ti post works with the older Enve (single bolt) clamping system and I don't have the right adapter to allow the use of a carbon rails.
As such, I'm now using a Antares with ti rails and white logos instead of the full black one with carbon rails I had in mind. I had both already so no drama but I prefer the black on black on this one. Whenever I'd like to use a seatpack I prefer not to ruin the paint on the ti post. I also got a great deal on a Brooks C13 which I'll give a try to see if I get on with it. Might end up on the Baum actually.....