T3. Lighter, barrels made probably in same factory, A7 was more expensive when I was looking at them but no better. A7 did initially suffer with some bedding problems as reported after first launch whereby barrel touched stock and didn't fully float properly, affecting accuracy. Not all had this problem but some certainly did as it was widely reported. Stock mount bases for sights were a weak point and many changed them. I looked at one and tried it out when I was looking between that, a T3 or a Bergara. The A7 with an aluminium chassis or spine at least which runs the length of the fore-end back to the action showed promise but I felt it was too heavy for the field, and the plastic part of the stock was too close to the barrel plus I didn't like the mounting points at all. The T3 fitted with picatinny rail was much better as a scope base, as were standard optilocks and the receiver base for these on the T3 was bomb proof.
T3. Sweet spot in model range depends on calibre choice and intended use.