Like many others, I also have some experience with various grades and styles of AR.
If you want the short answer, BCM is my favorite. I run a lot of Bravo Company parts even on non-BCM builds.
Other turn key options are the IWI Zion 15. Or PSA Sabre. Or any other brands, I like Stag, I like Aero sometimes (same parent company as Stag). Colt sucks anymore but that will make people mad.
But truly, sometimes the "tactical" rifles are actually simpler than the "no grills GI models". Take a free float rail. Simpler, smoother, lighter, better than an old multi-piece plastic unit.
Or, if you want to stay boomer, there's this:
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