I've owned all the above mentioned. My TT 5-25 had the finish wear off the turret after a couple month of heavy use. Other than that they are rock solid. That said if you're going to shell out that kind of bread I suggest you look long and hard at Hensoldt. Not many guys own them but those who do will never own another brand, me included. I've sold most of my scopes and replaced them with Henny's. I would rank them easy above TT and S&B. Just my .02$ If you're looking for a dealer I think Tactical imports carried them. They are IMO the highest quality scopes money can buy on the civilian market.
A lot of good info here.
I fallowed the T.T development carefully with hopes that one day I will be supporting a Canadian company and Canadian product.
My line of thinking changed quickly... when the scope overnight jumped from $2k-$3k to $5k+.
In my opinion once you get into tier 1 price bracket...the law of diminishing returns pokes it's ugly head!
So that would mean Schott glass in Mainz, Germany, I guess (now owned by Zeiss).^Spoke with them at SHOT, glass are from Germany.
I was told by TT at SHOT that they are the only manufacturer that passed the cold test at -20C. They test them all the way down to -40C and they still work. But personally I wouldn't be shooting at those temps. lol.