If I had to chose one I would have to go with sierra. the reasoning may not be very solid as I havent reloaded in some years. but when I did, sierra was the only bullet readily available that was heavy enoughfor my intended needs.
My pet caliber was the 5.56/.223 and I was working up a low velocity deer load.
but all in all, they allmake some really nice bullets. I have no problems using any of them.