Boston vs Seattle, Which should I move too?

I have been planning this for months now but I feel I’m missing some elements that will lock in an answer. So I’m reaching out to anyone who has lived or is living in either (Or preferably both) city to give some insight. Which of the two will offer an overall better quality of life for me?

* I am 24, no wife, no kids. Not anti-social but I generally keep to myself. I favor a quiet lifestyle but am willing to open to new things. (Nightlife included but I’ll stick to day activities)
* I have lived in hot weather (Currently living in San Antonio, TX) and cold weather (Huntington, WV) so either side doesn’t bother me too much.
* No license to speak of but due plan on learning to ride a motorcycle when I settle in in either city, so walking is my preference with public transportation being my backup for long hauls.
* Game designing is my go to career with being a Firefighter my fallback, however I do have experience in Room Service in nice hotels (My plan was to get back into hotels when I get to either city and continue from there.)
* Finally I picked up a new hobby, Boxing, so I would like to continue this hobby in either city.

I have no contacts in either city, when I move I’ll be bringing clothes and a few other personal belongings. With 3,400 in the bank I had decided that I’ll live off on 3,000 as I search for a job, if things look grim my bug out line is nearing 400.

The cost of living in both cities is more than San Antonio so it hardly matters if one city is slightly cheaper than the other, what matters is, given all that I’ve laid out, which city in the long run would I enjoy living in the most?