I just put together a little 6x47L, and while it's accurate and useful, it's awfully close to a .243. Its capacity puts you in the 40-44 grains of 4350, 4831, N160 or similar, and heats a little sporter barrel up accordingly. I think the 6BR is more versatile as you can get impressive accuracy out of bullets weighing anywhere from 68-105 grains, efficiently, and with what's reported to be longer barrel life. I bought 2 identical Krieger barrels (in case I loved the 6x47L so much I had to have 2) and I'm chambering the 2nd in 6BR, throated for 95gr Bergers.
