Although I personally don't have experience with either comoany, looking at their products on-line:
Unlimited -- Their hood is listed at 35 pounds (my factory T/A hood is ~45 pounds), so, their is weight "advantage", IMO, for the lighter hood from a "performance" viewpoint. However, their hod may be more fragile... light weight springs are mandatory (for all these f/glass hoods, but you may want to consider not having the springs at all.. I've used ~50" long thin hood bars hinged under the core support with a pair of clips at the front grille support area to hold the two bars with the hood down. Also, you'll have cut open the rear screen vents and install the mesh. Price is reasonable. That 10 pounds off the front end all adds up to continued weight loss = faster times, better handling, etc.
AAR Fbrls -- Their hood has the "steel" inserts apparently molded inside each hood side section to prevent they common warpage (caused by the springs). They don't say the weight of the hood... probably a little heavier than the factory hood (my guess it weighs about 50 pounds?). They don't say anything about the rear screen vent openings. Price is a little more than Unlimited's.. still not unreasonable.
You may want to check with VFN Fiberglass (Addison, Illinois?). I know they can make a T/A hood... and they've already made a couple AAR 'Cuda hoods, as well (light-weight for performance).
So, if "performance" is your prefered desire, the probable lighter weight Unlimited hood would be the choice (actually, that's what I'd prefer). If long-term durability (non-warpage) is more-so desired, the AAR Fbgls hood would be the choice.
Regardless, consider removing the springs.
