I prefer Music Together...
I had done MT for about 3 years (with 2 kids), did 1 semester of Suzuki's Kodomo Music, 1 semester (8 weeks) of Kindermusik.
Kindermusik Pros: It's nice that Kindermusik gives you take home instruments. Cons: I think the female singer in Kindermusik sings in a pitch that is too high and I can't sing along. We had an 8 week semester and were given two different CD and book sets. I don't think 4 weeks is enough to learn songs before getting a new CD. The book doesn't have lyrics or printed music.
MT Pros: They have a music books with all the lyrics and music notes. If you can read music or play an instrument, it's neat to have. Sometimes I'll sit at the piano and start playing one of the MT songs and my 2 yr old will light up. They do a lot of parent education - by email, during class, on Facebook, etc. The 45 min time is completely about music, dancing, singing, clapping, playing instruments, etc., no storytime like Kindermusik. The opening and closing songs are always the same. I understand in Kindermusik, the opening and closing songs change with each different age group? Speaking of age group, MT is for all ages up to age 5. When I looked in the (city rec center) catalog, Kindermusik was divided into 4? different age groups. So, what if you have two kids? You have to take them to separate classes?
Cons to both: They're expensive! I would ask the teacher/ owner/ director if there are any discounts.