Looking only at the components, I think Giant gives you a lot for your money. I also think there's more to a bike than the component spec sheet, especially in this mid-range level, where the differences in the components are relatively small. Unless you're competing or putting hundreds of miles a week on a bike, there isn't a whole lot of difference between the mid-level components. That's not to say that I think Tourney and Deore are equivalents, but I think Altus vs. Acera is splitting hairs.

To me, the two most important factors to focus on are fit and appearance. Fit cannot be changed, at least not without buying more parts. If a less expensive bike doesn't fit as well as a more expensive bike, you either have to just put up with it or spend money in parts like stems and saddles to change the fit. If you do too much of that, the price difference starts to go away. You also can't change color or style very easily (at least not being able to make it look good).

If one brand fits exactly the same as another, and you like the colors and styles an equal amount, then sure, a case could be made to buy the less expensive one. I do not advocate shopping by component list as the primary factor, though, and I think the importance of component spec is sometimes inflated. Factors like fit and appearance will likely play a much larger role in ownership satisfaction than whether the rear derailleur is an Acera or an Alivio.

Cheers!