I have to admit to leaning towards clubs on their singer/open nights and thinking twice about going on their guest nights. Admittedly I'm also constrained by having to manage my fatigue levels but have dioscovered that I'll make more effort to go to a club when they haven't a guest. I prefer the entertainment on the less formal evenings.
Having said that, there are some guests that I will always make a point of seeing and I am very fortunate in the quality of floor singers at the clubs to which I usually frequent.