I've long since switched to briquettes (finally got fed up with the inconsistent quality control of lump) but used RO red bags for a long enough time to say I liked it. Didn't love it, but liked it.
I don't think there is a "best" lump out there. Too many brands/bags have such inconsistent QC that its almost like gambling on what's gonna be in the bag. I eventually got tired of the risk taking and made the switch to Stubb's briquettes. Have yet to look back and regret that decision.
To me, the best lump is packed into little pillow shaped black pieces.
18" OTS, 22" OTG, SJ Silver, Cimarron Offset, Coleman Bullet, PBC, UDS, QMaster ATC