I have done both kits on various diesels, 3B, 2H and !HZ. Overall I like the turbo-glide better because of the cost - you get more bang for you buck, not to say that the AXT and the Turbo-glide are a straight up comparison, they are not. The turbo-glide takes the approach of no water cooling, whereas the AXT does water cooling as well. As far as kits go they are both pretty good and both might require some modification depending on the truck it is going in. Keep in mind that both kits are designed for right hand drive so depending on what you put it in you will have to do some modification, off the top of my head I can tell you that 2H in a 60 with left hand drive will require some mods. Putting a AXT on a 4x series with 3B will require mods. No problems with 1HZ in 7x series right or left hand drive with the TG model. I have not seen the AXT on 1HZ but I can recommend the TG on 1HZ. Safari I would have to say is the most money of the 3 of them and I am not sure why, does not seem any better than the other two. Both AXT and TG use Garret turbo's and the Garrets are very good from all the ones I have had and installed.
Just and FYI, I will probably be stocking TG Turbos for 3B and 1HZ engines very shortly so if you are in the states and want on of those I should be able to get it for you saving you a bit on the shipping.
Cheers,
Michael