As far as I know, there is NO objective data available comparing the quality of 6V golf-cart batteries.
Anecdotal reports such as "I got seven years out of my XXXX batteries" mean very little, because the end-of-life point is not defined.
Batteries begin to sulfate and lose capacity from the time they leave the factory. That capacity decreases over their lifetime. Some users may find that a battery
having only 30-40% of its original capacity -- or even less -- is still "good". Others may find that a 60% battery
capacity is "not acceptable". Some, apparently like you, define end-of-life as "died".
This slow erosion of capacity and variable tolerance among users for reduced capacity makes it extremely difficult to determine how good an individual battery or battery brand may be, especially in the absence of an intervening factor like a shorted cell, and in the total absence of objective comparative data.
If you got "twelve years of use" out of T-105s -- which is way, way beyond the usual 3-7 years -- then you're likely to get useful (for you) life out of just about any golf-cart battery.
Bottom line: you pays your money
and takes your chances.