Overall, I still see the TF factory replacement tank as the best option, but I recognize that cost may make it not worthwhile for some folks.
I’m presently doing the transfer tank thing (similar to Titan Sidekick), and it’s a pain. I always wind up with some residual gas in the siphon, and some fumes/spill to deal with. Plus, the transfer rate is very slow compared with filling at a gas station. In my mind, there’s no question that a larger replacement tank is the preferred solution, but again it's a matter of cost.