I'm not familiar with the Giant, but I can clarify a couple things you bring up about the Jamis. If I understand the specs, the fork itself is not Cromoly (steel), but the steerer is. This is the part of the fork that inserts into the frame and that the stem goes around. The fork itself is "alloy.". An alloy of what it doesn't say. That would be a good question to ask the bike shop. I
Carbon forks, like what's on the Giant--are lighter. Depending on the fork, it might provide a somewhat nicer ride. I love the ride of a steel fork, but they are typically heavier.
As for the crank, it looks like the Ventura uses a "compact" crank. A compact is a hybrid od sorts of a standard double and a triple. It offers a few more small gears for climbing, but offers a few fewer big gears for sprinting and descending. It offers the ease of just two chainrings like a standard double. If your terrain isn't overly hilly, it might be a good choice for you. I've had both triples and compacts. There are pros and cons to each IMO.
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