Ha 3 is extremely scratch/ding/wear/corrosion resistant. Bare aluminum can simply be buffed or polished if any of the above occurs, but it will not resist scuffing/scratching/whacking as capably as HA3.
Then there is the issue of cosmetic appearance. Bare aluminum will be very attention-getting and flashy (hey, it's a flashlight, right?), in addition to being easier to find in the dark. HA3 will yield the exact opposite result, unless you drop it onto white carpet or tile (duh). HA3 will include the Lionheart logo, and will more closely match the black button. Speculating here, but it will probably also make it look smaller.
A BIG issue is how quickly the bare aluminum will ship ahead of the HA3 lights. If you're in a rush, get bare Al. If you want a more durable branded light, stick it out and wait for HA3.
Hope that helps,
Steve