Somerville is mostly 30s no kids who don't care about the school system and West Medford is mostly upper middle class with young kids that are mostly preschool. Same can be said for East Watertown with new buyers. Often both groups will either move to Belmont, Lexington or Newton for both more space but also better ranked schools - if they can afford it, which for people who bought the past 2 years I doubt so anytime soon unless household income is $400K+.

Personally, I'd do Everett or Brighton 10 times before even considering Somerville. Way too dense, and not in a nice way. Medford was a hidden gem that's discovered and property values there will keep going up for years to come. Malden will absorb the cash from those that are now priced out of Medford but still looking for somewhat similar access to the city although the orange line is a huge bonus for sure