I am very happy with my Hex. Sorry, I do not have any experience with the Ti Goat. There are 3 reviews of the Goat at http://www.backpackgeartest.org
My Hex 3 is an excellent winter shelter and stable as a rock in the wind. It is reasonably easy to pitch it in a rainstorm and keep the interior mostly dry. It weighs 2 lbs, 1 oz. with stakes.
In very humid conditions, condensation does form on the walls, however, in my experience, most tents that provide secure shelter share this trait. I haven’t found the condensation to be a problem in the Hex due to both the steepness of the walls (the condensation harmlessly runs down to the ground) and due to the large area (it’s easy for two people to stay away from brushing up against the walls).
In dryer conditions, the top vent in conjunction with pitching the bottom of the tent just off the ground, creates enough updraft to minimize condensation. I have customized my Hex by sewing a 16” wide strip of no-see-um bug netting around the perimeter that I tuck under the floor to keep out the bugs and creepy-crawleys. It added 3 oz.
In dry environments, I use a tyvek sheet that I cut about 6” smaller than the tent all around. In wet environments, I use the Golite Hex 3 floor. It weighs 22 oz, a few more than the 11 oz tyvek, but will float like a boat!
My only negative comment on the Hex and all other “pyramid” type tents is the lack of a vestibule, which would help with ingress and egress during downpours. Due to the size and shape of the Hex, there is plenty of room for two people and all their gear inside. I am over 6’ tall and keeping myself just south of 200 lbs and yet I can really stretch out in the Hex.
Note also that this is not a warm summer’s night tent.
I hope this helps you with your decision.