Most of the time it's Kingsford Blue in my WSM because I know how it's going to work 99.9% of the time and know exactly how long I can count on steady heat before it drops off. On the rare occasions I need high heat (>300*F) in my WSM I'll use lump.
Always use lump for grilling because it burns hotter and seems to light faster in a chimney.
Pretty much my EXACT take on this issue. I buy both lump and briq's, but buy both when and where I can get them for the least $.
My goto is K-Blue because I get it for cheap. I also know exactly what to expect. I really like Royal Oak lump as well, but I've had some (more) inconsistent results with it and it burns away quicker typically.
Personally, I have ZERO issue with having to dump out ash once in a while from the UDS and I have no real airflow problem the way my charcoal basket is designed, so for me ash is not a real issue either way.
I will ALWAYS grill with lump as long as I have some because it's hot and clean and lights a lot faster.
SO....all in all, I'm a briquette guy, but don't at all disagree that lump has it's advantages as well. I'm also a farkin cheap bastige.....:roll:
I LOVE my stick burner as well. It's probably my favorite smoker to cook on, but not the one I used most often. It takes a LOT more babysitting than my UDS or ECB. On long, overnight cooks, I'll always go to my UDS with charcoal because it's like a farkin oven....set it and forget it. The stick burner does have a lot more capacity, though, so rather than firing up multiple smokers, sometimes I just get it rollin with charcoal (read: 4 hour burn time between refuels) and suffer the loss of sleep.
All in all....it's a personal preference thing. There's really no right or wrong to BBQ. It's all about what works for YOU. If you're happy with the results you're getting, don't let anyone tell you you should change a thing. If you're not, adapt, experiment and LEARN. THAT is what I love about BBQ.....it's always a learning experience!