Thanks BroWhen I bought my Bosch 3 years ago Bosch and Siemens were in partnership. So its the same units just different branding and slight cosmetic differences. Not sure if anything has changed since then but I would buy whichever is cheaper with the same feature set.
Warranty service is on point as well. First call out they replaced the entire unit since the door was skew upon delivery, second call out they replaced the tablet dispenser. No issues.
There's also a Bosch factory shop in Midrand that's worth checking out before you pull the trigger.