Another thing to consider is how will your pack be utilized?
Is it just going to be a display piece?
Are you going to be traveling a lot to all kinds of different cons, events, etc?
In my opinion, from my experience building 2 packs which are used quite a bit during Halloween and a few other events through the year, if you are going to be utilizing the pack at cons or events regularly, an all aluminum thrower is definitely the way to go.
Both packs I have built have experienced thrower related accidents every year since I have built them. Whether it was dropping the thrower from various heights to knocking them on door frames, a repair or two has been needed.
My own pack is the one that experienced a drop from my belt where it was hanging, which pretty much cracked the original resin thrower in half and though it was repairable I was pretty much tired of repairing the thrower every year. That was the year I converted my pack to an aluminum thrower. Since then I have still had some of the same accidents as in the past but they only resulted in a chip or scratch of paint here and there, essentially weathering my pack for me.
Now I know some of you may say well shoot you should be more careful with your pack while out and about. And to that I say, I built my packs to be worn and to enjoy my time out in uniform as much as I can. If I have to worry every second about my pack and the environment around me when I wear it out, the enjoyment gets sucked out of the occasion for me.
Don’t get me wrong, I am not trying to take anything away from the resin kits because the first versions of the 2 packs I built both had TC’s v2.5 thrower kits (one of the packs still has one) and they were fanominal. The just didn’t work for the type of build I was going for.
If you are careful and are ok with being careful and cautious when wearing your pack out, a resin thrower from any of the sellers here will do you just fine. On the other end of the spectrum, if you are building another pack that would be just a wall/display piece then I would go resin all the way.
Just my 2 cents.