The trip was originally planned for October of last year to celebrate my husband's 10th year of remi

I'm down to the last minute and my husband and I are still having trouble deciding between 9 days in Stockholm or 9 days in Munich, arriving April 2nd. The biggest consideration is that we do not want to rent a car, nor spend all of our time traveling between destinations.
If we were to stay in Munich, we are open to Salzburg, Vienna, travel short cuts Bratislava (only as a continuation from Vienna), Prague, Zurich or other recommendations in the area. We would prefer to not take a side trip from Munich that is more than 6 hours to the destination since we would like time to enjoy the area and relax while on vacation. It looks as though train travel is excellent in the region. That being said, we are not fluent in public transportation and any pointers would be greatly appreciated.
Wondering why you'd pick either of those destinations for a trip in early April and for nine days. I'm all for not trying to cram too much into a trip, especially a first one, but I don't think either of those cities would be most people's choice for nine days and certainly not in early April.
Copenhagen is not exactly a 'side trip' from Stockholm. travel short cuts I actually did do them on one trip (in summer time) but flew between them and split the time. So I guess I'd vote for Munich and continue on to Salzburg and Vienna - maybe three days in each, travel between them by train - you have to take into account the time to travel between them so I'd arrange it so as to have less in Salzburg and more in Vienna. Maybe 3-2-4 so you could do a day trip to Bratislava.
But Ira's idea of London and Paris would be better for early April - there is plenty to see in both cities if the weather is bad, easy transportation between them. And of course Italy can be nicer weather in early April than either Munich or Stockholm and there is so much to see in Italy. A nine day trip there most people would split evenly Rome, Florence, Venice.
There are a lot of places we could recommend for 9 days that would be great. I've been to both of these cities and although I liked them I did not love them enough to stay there for 9 days, barely 4 in each was fine for me.
I like both Stockholm and Munich but for a first time to Europe visit I agree they are not the first cities that come to mind. London, Paris, Amsterdam even Brussels or Bruges might be better. It's Easter as well and Europeans have public holidays at this time so things are quite busy.
I went to Florence early one April couple years back and the weather was very pleasant. Day time temps in Stockholm and Munich are still cold at the moment, maybe MUC will warm up quicker than Stockholm by early April.
travel short cuts The trip was originally planned for October of last year to celebrate my husband's 10th year of remission; unfortunately there was a major restructuring at work that coincided then. As for those cities, his late grandparents immigrated from Sweden and Germany/Poland. My mother-in-law is contemplating a move to London, travel short cuts so we were thinking about going there after she decides.
travel short cuts Stockholm seems amazing, but I was wondering about so much time in that region; and we would have a 55 minute layover in Amsterdam. Munich seemed to have several viable options travel short cuts for traveling on to other cities via train, and is a direct flight for us.
I would pick Munich, mainly because of the weather in April. Suggested cities travel short cuts to visit from Munich (not as daytrips though but sidetrips with a few nights at the destination): Prague, Vienna or why not Venice?
Or fly in to and out of Stockholm. Do Helsinki, Tallinn or Riga as sidetrips. There are overnight ferries, departing early in the evening travel short cuts from Stockholm to these three cities, arriving in the morning the following day. You have then two options; one day of sightseeing and returning with the same ferry in the evening or to spend a night or two at the destination before returning to Stockholm. Ferries are modern, convenient and usually have some good minicruise deals.
Also, Stockholm/Copenhagen/Oslo is definitely more expensive than Munich and the surrounding cities even though it is not THAT expensive as some people travel short cuts on this forum sometimes say. But you will find all Scandinavian capitals in the top of the "most expensive European cities". Prices for alcoholic drinks, taxis and public transport are considerably higher in Sweden than in Germany.