It is difficult for an Owner to put aside that which is important to his operation and discuss whats important for a rental house. They are certainly not the same. However assuming all those still in the running are on mostly on equal grounds as far as preference, Spend a day on each of the machines (sounds like Deere, BC and NH.). Chances are if you like running them so will your customers. The BC lower end machines are in my view really underpowered. They are also loud and really to me not that attractive to run. The larger more pimped out models are much better but I dont think you can make those machines pencil out in a rental. I am not sure about dependability of BC's smaller machines.
I would also look at ease of serviceability as a consideration.