Oh boy, Im not sure where to even go with this. The tables have MOST CERTAINLY TURNED, since the HD's bootloader has been unlocked. Had you asked this ? a month ago, it would have most certainly been a JOKE.
I will use your pros/cons for my opinion as I havent owned an HD, but I most certainly know quite a bit of folks who have 
(all you guys)
OK So S3 Pros (via you, Gary) and my responses:
Lightweight - Indeed
Fits good in the hand - Yes
Beautiful 4.8" HD display - Yes
Removable battery - Indisputable
4.8" screen - Just the Facts
LOTS of development - True, but only at this juncture and as COMPARED to the HD...Dev has stalled like CRAZY lately. Most Dev is MONTHS old.
Cons:
Only 1 radio (hard to get 4G, even when 50ft from a tower) - I Disagree, any of the previous Radios ("modems") offered are capable of being flashed, and many people have considered several of the older builds to be better and more robust, the beholder is the only judge to this, and their locale has much bearing on the end users experience. Tl;dr: try 'em all, there are MANY past "modems" that can be tested.
Plastic build - To some, this is a benefit. Plastic is less likely to break, crack, shatter or fail as compared to glass, glass and more glass. And metel tends to show more knicks and scratches, their coatings tend to be less forgiving to falls than white, through and through plastic (SOURCING: my own experience of metal rimmed devices vs plastic ones...this is subjective, take it as you will).
Razr HD, A device, I to this day now would love to own, but have not had much day to day experience with, take this as you will (my experience hardly surpasses my times with my fathers device (which really isn't a lot):
Pros: Again, my personal responses...
Nice 4.7" HD display - I have indeed measured these 2 devices screen wise, and while this may kill my credit with our forum, the HD screen is Old School Nintendo NES in comparison (I'm sorry, guys)
Durable build - Again, to the eye of the beholder, My personal opinion is conflicted.
Cons (You know the deal):
Heavy - IMO, it's negligible
Awkward when holding - Still, to me, the thickness, it feels 'awkward', but still, is probably negligible...and if you referring to a non-Maxx....they are very, very close in feel.
Display is not a noticeable difference from the OG RAZR - And TO ME, compared to the S3, there is a WORLD of difference between an S3 and an OG, so if this is your opinion, you can draw you're own conclusions.
Only 1 radio (hard as well to get strong 4G signal if any 4G at all) - To be fair, there is now much to learned pertaining to flashing radios, as older ones may be more benificial to individualr regions.
SIM/sdcard slot cover doesn't fit properly - While it is under the battery cover on the S3, It is in a place on the S3 where wear and tear to a "door" is probably not relevant whereas a "door" will wear out and become weak and sloppy over time on the HD.
Not as much development - I will most definitely not waiver on the HD in this department at THIS time. Should the latest Moto/Google device come out on VZW just as locked the hell down as the most recent memory of Motorola/VZW devices and we not have any platform support inbound. And should the latest Samsung Galaxy S4 come in with a locked bootloader on the VZW network, I see the development of the HD surpassing the development of the S3 in the near future as it is now in it's infancy as compared to the S3 which has been unlocked and rockin' for quite some time. I can not speculate on the S4, or it's open-ness, nor can I speculate on the next flagship Moto device. I would say, at this moment, knowing what we know, this current Razr HD is more apt to be developed on than the S3 (hands down)! [Possiblly more-so than the S4 AND the HD successor!] I wouldn't discredit it on this factor at this very moment, but again, look at the factors against it!
It is ultimately your call though. But sh1s gettin', crazy and unpredictable at this juncture.
Good luck Bud.
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