I grew up playing the cello. Mostly playing classical music and I always wanted to play the violin. After college, I sold my cello and purchased a violin and have been playing it ever since. Recently, I started playing the cello again and was surprised at how much strength it took in the left hand. Both are beautiful instruments.
I did at one time try to learn viola, but with it being so close in size to the violin I found that I had difficulty keeping in tune on either instrument after a while! So I gave up the viola.