There is a lot of mis-information in this industry. All I can say is that a brazed, fillet brazed or welded joint done well will be much more than adiquate for your needs. There is no functional difference between these methods in day to day riding.
True Temper Platinum is a similar tubing spec to 853 and in 13 years I have never had a problem with it. BTW, I have made plenty of bikes for guys of your size (actually you would be kind of small) and used either platinum and 853 interchangably with no issues.
A TIG welded joint is very strong, but a properly done filleted joint, because its radius is so much smoother can be equal or superior in fatigue. TIG welding is quick and requires no after weld preparation and therefore is much more profitable for bike companies. That is one of the main reasons why it is so prevalent today on steel bikes.
All the best,