YMMV. I travel often enough between Zürich and Munich. As soon as the train crosses the border into Germany it starts to accrue delays. I'd say 80% of the times I arrive in Munich with 20+ minutes delay and 20% more than 40 minutes.
On the way back the train enters Switzerland with enough delay to fuck up Swiss timetables and so it accrues even more delays. So much so that makes an overcrowded Flixbus an alluring alternative.
So, long story short DB is absolutely terrible IMHO. The worst railway company in Western Europe by far among those I traveled with enough times to have an opinion (SNCF, Trenitalia/Italo, Renfe, DB, OBB).
On the way back the train enters Switzerland with enough delay to fuck up Swiss timetables and so it accrues even more delays. So much so that makes an overcrowded Flixbus an alluring alternative.
So, long story short DB is absolutely terrible IMHO. The worst railway company in Western Europe by far among those I traveled with enough times to have an opinion (SNCF, Trenitalia/Italo, Renfe, DB, OBB).