Of course a good compound miter saw would be the saw of choice.
Unless you are doing cove moldings, the TS55 and MFT will work too, but not as efficiently. If the weather is good, I usually set up my old Makita outside. However, I did a job recently and used the TS55, MFT and CT22 vac unit right in the house.
I just used a short guide rail, marked the moldings (which were flat) with a bevel square and cut on the mark. I always cut slightly long, then trim to fit. For sure it saved a lot of walking.
My personal problem is after carrying a piece outside to make a cut I tend to lose my orientation and have to go back inside to recheck my mark or measurement. With everything right at the site, I am more comfortable. With the Festool stuff there is essentially no mess. So I'm not convinced that either method is more efficient.