In general briquettes will give you a longer burn. If you get a good quality lump it will burn just as long. There is no "one " answer to your question. Lump burns hotter and produces less ash and is cleaner. Briquettes will burn more consistent and sometimes easier for some to control temps with, but most have binder and fillers which creates excess ash. Everybody has their favorite kind whether it is a lump or briquettes. I use RO lump in my gravity fed cooker and Walmart brand briquettes in my UDS. Only because one kind burns better in each cooker. Try some different kinds to find out what you like best in your cookers. Remember, they're no rules here, it's just bbq.
My arsenal, Stumps Clone, Two Modified offsets, open pit with grate and rotisserie,UDS, and a free to me Weber One Touch Silver 18.5" kettle