My question isn't about price or brand loyalty, but rather why would my LDS try and steer me from one package to another?
As several have suggested, profit, or the margin on the particular packages, may be an incentive. Also, shops do get preferential pricing across the product line as their volume of sales of a particular manufacturer line increases. So, it may be in their very best interest to enhance their sales of Aqua Lung, for example, or Scubapro. There is nothing wrong with that. But, what is best for THEM may not be in YOUR best interests.
I realize that your question was specifically about why a shop might 'encourage' the purchase of certain equipment. But, I will add a suggestion, that you do not immediately buy either of these 'packages', and spend a bit more time online, here on SB and elsewhere, and perhaps speak with other shops BEFORE buying gear.
Geobound:
The dive shop is telling me that the Apeks is better suited for me, and am wondering if that's true, and if so why? There doesn't appear to be any fitting issues with either regs, or BCD's, so I don't know how they can determine that its "better suited" for me?
You have already made an important assessment. It would be appropriate for you to ask them directly, 'WHY is this equipment better suited for
me?'
I am an Apeks user (along with a number of other brands), I have multiple Apeks regs (and other gear, for that matter), and I really like their products. The XTX200 is a fine unit, etc., etc. ScubaPro makes great gear, as well. But, frankly, I would not buy either package as configured, and I sincerely believe that you
might be better served by considering alternate configurations that the shop you visited may or may not want to sell, or even be in a position to sell. Now, I do not, sitting at my keyboard, necessarily know what's best for
you, any more than the shop pushing an Apeks package might. What I do have is a not inconsiderable body of experience with students, new divers, and experienced divers - and what gear choices ultimately seem to be beneficial - hence my recommendation to spend more time considering your options before buying.
You have posted your question in the new forum here on SB, intended for (new) divers contemplating equipment purchases. And, I would encourage you to broaden your questions about gear in this venue, before pursuing a purchase.