I shot a deer with a SST, broadside bottom of lungs. The bullet broke ribs on both entrance and exit. There was good damage to the lungs and there was a lot of frag and a permanent wound channel in the top of the heart as well. Exit hole was about 2 inches in diameter. The deer went about 25 yards, laid down and was out. I estimate about 5 seconds from impact to unconsciousness (was watching deer the entire time). Bullet used was 7mm 154 gr SST, velocity at impact would have been just shy of 2800 fps.
I have had good accuracy with both, but have not tried the Accubond on game yet.
On a side note, most of the prices I've seen for .277 mm bullets have Accubond at about 2X the price of the SST. Brings another point to my mind, Berger VLDs are about halfway between the price of the two you are comparing.. Don't want to get too far off your question, but couldn't resist
personaly I have not taken game with either but the Accubond would be my pick. They seam to be one of the bullets guys here favor above all others. We dont here to much chatter about Hornady bullets except of course the AMAX.
I have taken several deer with both bullets. While both are very effective on deer I find the AB to be generally more accurate in most of my rifles. The AB is also the tougher of the two, but that shouldn't come as a suprise since it is a bonded bullet and the SST is not.
Bottom line though, either will put a deer down in short order with proper bullet placement.