Alpha T-bars are noticeably stiffer than the I5 (its stiff enough that if you level it, the nose dive is very minimal- ive been riding 3 years without getting the extended stops while with the I5 I didnt last over a month)
On road handling, less sway. Dropping off kerbs has less side to side bounciness. Without the extended stops, the truck starts feeling unstable at speeds of 100 mph and above, as the front nose lifts up due to air resistance (below that speed is completely fine).
The Alpha bars dont lift the truck higher than non alpha, since both circumstances the bars can be adjusted. They just sag less when you add weight like a winch/bumper. You would still have to adjust for the added weight in both cases. The Alpha bars are less bouncy when you have weight added too.