I am confident in using Kingsford Briq's. That is what I started with. Over the past few months I have been trying different lump brands, not much choice around here, and I can say that I am happy with the results. My gripe is the quality control of the lump. It seems every bag that I get has a LOT of small pieces and dust in the bag.
I guess I just gotta get over it as once it is done burning I have less ash with lump compared to briq's. It's just that I have more waste at the beginning with the lump.