I think I tend towards the dave approach. Test them all and keep the ones you get on with best.
I know I have acquired too many over the past few months, and I really don't want to have a Hosk-esque storage problem, so I'm testing, deciding and offloading.
What I've found though is that some bats appear to work better for you than others and some feel deader than others. This is probably more down to the way I use them than anything else, but I've llearned which of mine is my absolute favourite and which ones I am unlikely to use in the future. Time for more sales I suspect...