What Tehawk says is true. The tuning procedure is the same whether the bow has one cam or two. Actually, more can be tweaked with a two cam bow to get more out of it than with a single cam bow.
The biggest difference between Pro series bows and Gold series is the strings. The Pro series come with Dakota strings made by Stone Mountain, a higher quality string than the Helix strings on the Gold Series. This usually about a $75 upgrade when replacing strings. The Helix strings can creep a bit more and experience peep rotation, which means sometimes a bit of adjusting periodically to keep the bow in tune. It's not all that bad, but something to be aware of. Most people may never be able to tell much difference except for the peep rotation issue.
What you, as a potential customer, must decide is whether you want to dish out the money for premium strings and/or two cams. The dual (Cat) cams will be about 15fps faster for a given draw weight shooting the same weight arrow. They also have a different (harder) draw cycle, but not as bad as some would think.
Doing a more hjonest comparison in performance, I like to suggest setting both bows up to shoot the same arrow at the same speed and then weigh the draw weight. The dual cam will produce equal speed compared to the single cam, but at about 8# less draw weight.
If you are just a bowhunter and hunting whitetails in most hardwoods settings then speed should not be a priority anyway. The difference in point of impact is only about 2" when comparing that extra 15 fps.
The best thing to do is, if possible, shoot both bows in a side-by-side comparison, then make your own choice.
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