I really like the TA33. It's a nice compact little scope. I'd opt for the one with the green reticle. When I tried the one with red, I'd lose the reticle in foliage when under a canopy of trees. On the other hand, I think the Leupold will have better glass. For that matter, my Sightron 1-5X Big Sky had better glass than the ACOG. Lots of guys comment that the Trijicon products have the best glass that they've ever seen.
I don't know what it is that they've seen, but it's certainly not the best glass that I've ever seen. The ACOG is a pretty purpose specific piece of gear and is built tough. Forged 7075 as opposed to extruded 6061, if I remember right.
In any case, if your needs require something tough with pretty limited purpose, then an ACOG may be for you.
I don't know. Really, only you can say what's going to be better for you. I really just don't see any reason for the expense of an ACOG. It's small and compact, but may even look weird on a full size AR. The conventional scope will certainly be more flexible and will offer a wider field of view. The TA33 has a pretty narrow field of view and pretty much requires you to shoot with both eye open in order to see much other than the target at up to 100 yards.