I'm local to Chattanooga and ride a T5G (with Di2)and have 2 Lynskeys (road & mtn). I am friends with people at both companies, so I might be biased. That said I honestly think you can't go wrong with either one. I don't know of anyone personally that has had any warranty issues, but at least for us locals, Litespeed (American Bike Group / ABG) goes above and beyond to be a great partner. I could go for hours about the good things they do and how they support their customers. Other's experiences may vary, but they have been under new ownership for several years now and the owner seems to really care about the reputation and helping the athletes (he is a triathlete and races a lot himself)
I picked the T5G over the Sportive or Urbansky. As far as why, I liked the looks of the T5G and from my understanding/experience it is more of a road bike with more clearance so it rides more like a road bike and the Sportive and Urbansky are more leaning towards touring bike handling. I've only ridden a Sportive and Urbansky 1x each, but each time I got off glad that I got the T5G. That said, I only made minimal adjustments to the Lynskeys when I rode them and I've got my T5G dialed in for me.
As I said though, I don't think you can go wrong with either one.
