This is a question that might never occur to me, because I don't think of them as an either/or choice. Id do both, and configure each for different applications because they are going to have different attributes which make each better for a different application.
Accuracy is important, but maybe more important in the bolt gun, where a followup may not be as easy to deliver in a timely manner. The semi can be very accurate, as accurate; but may not need to be considering the ready onhand followup capacity.
Consider also that additional uppers can provide separate, different capabilities for the AR. They may range from lightweight run-n-gun, to LR precision capabilities. My AR is a Stag Model 6 Super Varminter 24" bull barrel rifle and has a Harris Style Bipod attached. I also have a lightweight run-n-gun Upper, and a 16" bull barrelled Upper with a Harris Style bipod. That covers a lot of applications.
The Lower has a B.A.D. Lever added, and the A2 Stock has been replaced with a Luth AR MBA-1. One of the magazines has a Satern single feed follower installed for F T/R.
I have several Bolt rifles, but I seem to be standardizing on a the Savage, with the 11VT platform from Dick's Sporting Goods becoming a standard pattern rifle. I own a pair, a .223 and a .308, and intend to obtain a second .308 for reconfiguration with a barrel replacement using a Lothar-Walther 28" .260 drop-in barrel.
Optics follow application. The Stag 6 has a Weaver V-24, the 11VT's each have a Mueller 8-32x44 Target Scope. The 16" Bull has a Bushnell AR Drop Zone 3-12x40, and the 16" run-n-gun has a Vortex SPARC.
Greg