S&W M&P15X vs. RRA Elite Comp (need quick opinions please)

I am tired of trying to hunt down the various parts and looking at paying crazy high prices for my intended build of a LMT or BCM 16" as my first AR rifle, so I have decided to buy off the shelf. Today!

I have both of these rifles in local shops within about $70 of each other and wanted to know which you’d go for. Both are already somewhat “upgraded” models, and I can take it from there, customizing as I can. But, before I head out to buy one this afternoon I want y’alls opinions.

So which should I get?

S&W M&P15X (priced locally at $1300)

or

RRA Elite Comp (priced locally at $1370)