The Grand and the 18490 are not that far apart. Basically, the 18490 is the same thickness as the Grand, and the same height as the Mini. The Grand if very portable (IMHO) and ALL the new rebuildables will fit the Grand with no problem. The Grand would be my choice for that reason alone. The Grand is the size of a business card. I'm going to go try to find thahe picture that shows the sizes. And besides the size not being a problem, the bigger bottle (6 ml vs. 3 ml) and longer battery life are both nice. Just my opinion. I just know that now that I've changed over to all rebuildables (you will too when you try them, I'll bet) that I'm wishing I had another Grand and one less 18490.....
Gonna go try to find that comparison picture....
Jan
Jan