Controller all the way.....the KB/m controls are nigh unplayable. No surprise there though (modern PC ports and all).
Its also a VERY demanding game. Use utube totalbiscuits "GTAV port report" to optimize your settings; a couple of them are ludicrously performance expensive without telling you that (read. -30 fps on his dual titan x system).
Disabling those unnecessary features and u should get solid 60fps or so with a gtx 970+
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