Much as with 10/22's, an AR-15 can be a 'rabbit hole' in terms of experimentation. If you are simply looking for a Plain Jane AR that 'fits' you, as others are suggesting, there's not much difference out-of-the-box, at least in general, and, often, brand loyalty holds greater sway. If you're looking for an High-End model, with several 'customized' features, I wouldn't be overly optimistic that you'll find one or, at least, a wide variety at any, given rental facility in a given area. For instance, even the recommended Route 66 has certain 'limits' on the AR varieties available; though they do have a 'cross spectrum' of styles, it can run you a bit of money to 'test' every 'variant' on the market.
AR-15's, for some, are buy once, cry once and done. For others, they are a bottomless hole; i.e., much like potato chips for many, you can't just have one. For still others, they become an endless quest for that 'perfect' combination where there is always, lingering doubt that there might be something 'better,' be it an assembled rifle or 'custom' part, lurking out there which has, to that point, escaped their attention and Heaven help them when something 'new' is introduced.
Put another way, what I believe you are seeing in the responses thus far are attempts to be 'helpful,' but a bit more detail from you regarding what you are looking for vis a vis 'differences' might provide some insight into how to better answer your question. That includes directing you toward a shop which might 'best' (insofar as is possible) meet your expectations/needs.
AR-15's, for some, are buy once, cry once and done. For others, they are a bottomless hole; i.e., much like potato chips for many, you can't just have one. For still others, they become an endless quest for that 'perfect' combination where there is always, lingering doubt that there might be something 'better,' be it an assembled rifle or 'custom' part, lurking out there which has, to that point, escaped their attention and Heaven help them when something 'new' is introduced.
Put another way, what I believe you are seeing in the responses thus far are attempts to be 'helpful,' but a bit more detail from you regarding what you are looking for vis a vis 'differences' might provide some insight into how to better answer your question. That includes directing you toward a shop which might 'best' (insofar as is possible) meet your expectations/needs.

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