I used to live in Glover Park, and Tenleytown was (and is) the closest metro. (I used to commute in by bus.) From a commuting standpoint, I'd go with Tenleytown for driving or taking the Metro. River Road and Wisconsin Ave. get pretty backed up during rush hour. The Metro has more problems in reliability in the last few years, but it's still a viable option.
You won't have a problem finding fitness/yoga studios either Bethesda or Tenley Town. There's a Y in Bethesda, and I'm also pretty sure that the public has accessibility to Woodrow Wilson h.s. pool in TT.
In terms of restaurants, there's not a lack of them anywhere, and pretty sure having a Starbucks in mandated every three blocks in the DMV. Just kidding--the mandate is actually every two blocks.
When I lived in Glover Park, I loved walking through the park, to the zoo, around the Cathedral. Popping down to Georgetown was easy, or other surrounding neighborhoods of Friendship Hts, CC, or even Spring Valley for a bite to eat or coffee was easy.
I live Bethesda adjacent now and I feel much more tethered to that bubble.