When I gig, I take out two keyboards: a Roland Fantom X7 and a Roland VK7 just for organs, although it's not the best (see below). Depending on the size of the gig is whether I take a Leslie out or not. Usually not. Say what you like about samples, they just can't cut it. A decent organ player plays with drawbar registers and effects all the time when he's playing, even just pads, and samples simply can't recreate that.
I just moved back to the US from the UK, where I had a Hammond XK-3 (with vintage Mullard valves) running through a Leslie 860 (solid-state) with a valve pre-amp, and it rocked (all now sold). I still own a proper/real Hammond A-100 (home model of the B-3 as noted above in the thread), so I have a 'point of reference', so to speak. The XK-3's built-in Leslie simulation isn't as good as the Roland VK7 (which I also currently own and believe to have been the best Leslie sim, although it's tonewheel modelling is very thin and outdated now). The new Korg CX3 has too springy of a keyboard feel for me. I just plain didn't like the Roland VK8 or the VR-760. Nord gets close with it's dual-manual machine (C2? I forget the model number at the moment) but still needs a real Leslie somewhere to make it fill out.
So: Hammond XK-3 has the closest raw tone but needs a Leslie
Roland VK7 has a great Leslie sim but is lacking in tone
VK8/VR760/CX3 have weak points for me in tone and/or feel
Nord is good enough but, like the Hammond XK3, needs a Leslie.
Personal opinion - everyone's got one!