Hey, finally a question that I have intimate knowledge of. I was an engineer for Trojan for three years and worked with nearly all of their products a lot. First off, I worked in the area where Trojan not only cycled all of their own batteries, but also the competition. Trojan always come out on top for total cycles, and I mean always. Maybe not the least expensive, but the best in my opinion.
I would go with the T105 only because it appeared to be under rated for reserve minutes more than the T145, therefore the difference in the two batteries are not as great as it may seem.
I also like the extra water/acid in the T105 so you can go a long time without having to fill them up with water.
These statements of course very with rate of discharge, depth of discharge, type of charger, and frequency of cycles.
2006 Alpine Limited 34FDDS