For what it's worth I've recently faced the same decision.
Reece profiles are designed to be light, fast, and accurate.
SPR's are used for sniper / precision support.
Basically it comes down to your intended use and what use you may be pressed into with the rifle. It's a fully mission dependent choice
If you're only interested in accuracy and want a AR platform look at the longer Bull barrel rifles designed for varmint hunting, etc.
The SPR used by SF is an 18" bbl rifle. It is more at home on the rooftop of a cullot in Afghanistan providing overwatch than doing CQB. Could you use it to clear the house? Absolutely.
My choice was both an 18" Stealth and a 16" mid length. The Stealth is for the precision long range capability and very slight extra velocity. Since I'll never use this rifle for entry work I had no issue with the extra 2" of barrel length. The 16" BCM mid length lightweight with an Aimpoint for training and coyotes.
A 16" free float will have negligible difference in accuracy (especially with the same optics) with some people touting the shorter barrel is more rigid making it less susceptible to barrel whip. This would most likely serve the purpose as a all around platform. (optic dependent)
Belmont has the best answer: get one of each!!! That's what I ended up with.
