If I had to pick between the two, I would go Sherwood. My rationale is simple. Their regs are simple, yet very reliable and overall the parts for servicing them are cheaper. When you compare what you would spend over the lifetime of the reg I have found that the AL parts kits are more expensive. I am not overly familiar with their respective warranties, but you may want to compare the two warranties, add in your initial purchase price and do some research with your local dive shop to find out how much the parts kits are for each of the regs you are considering. That will yield the best bang for the buck. When I was first getting into diving, I went the AL route and found as my experience grew, I wanted a regulator that gave me more control over my breathing resistance. I went Scubapro at that point. I also have a few vintage regulators that I purchased on Ebay that were an absolute steal. I bought them and rebuilt them myself and saved quite a bit. I also am a regulator service tech, so I can do that.
