Both are good shelters. I've made and use a TT1 and have used a Squall 1, as well as a Cloudburst.
The Squall was my first step away from a full tent when I was convinced I needed wider coverage than a Virga. I later sold the Squall and got a Cloudburst for the increased interior volume. I think the Squall 2 is closer to the Cloudburst in volume.
After I was comfortable with less than a full tent I made a TT1 and that's my goto tent for most use. I made it with a beak on both ends
If you enjoy making things and using gear you made OR if $$ is a big factor then definitely make one. Otherwise, I'd advise buying a Squall 2 or Contrail
Being the same on each side, the manufacturered TT's are a bit less sensitive to wind shifts (for rain or cold)