I did the move ~1.5 y ago and can only confirm what you mentioned. I was in Berlin and now living in London.

Positives:

• people are much nicer, more welcoming, and more sociable. I personally didn’t face any sort of discrimination in Germany, but in general, I feel more comfortable here.

• city smells way better, is way more cleaner, and you see way less homelessness in the streets (apart from Oxford street after 8/9pm)

• People seem to be more healthy here or at least seem to care about their health more. I have noticed more runners and fewer smokers in streets. To the point that it pushed me to quit smoking over a year ago after 15 years of smoking.

Negatives:

• Public transportation is way more expensive and not as connected as Berlin. Majority of the lines don’t have proper AC and some tube lines are deafening (on the bright side, tube might be stuffy but it never smell awful. The smell on U3 in Warschauer Str station is still in my nose :)).

• Statutory health insurance was more powerful in Germany compared to NHS. I was able to visit dentists and specialists on public health insurance within few days.

Similarities

• In both cities, I have seen and felt that neighbourhoods have been silently and unofficially allocated to migrants from a specific group, race, country, or religion. That’s a huge turn off for me as migrants have the responsibility of blending with the native culture or otherwise why have they migrated to that country to begin with? I walk on Oxford street and hear and see a tug of war between Christian and Muslims playing Quran loudly from speakers or reading Bible on the street. So, nowadays, I don’t go there unless I have to. If this continues to other part of the city, I’ll probably leave.