I would get a Sunrace. They only have like one gearing option and if that doesn't work for you get an IRD. The new Shimano freewheels are horrendously ugly with the black big cog and Shimano logo on it, looks like something on a Walmart bike. But the main thing is that all three have ramped teeth which will greatly improve shifting, especially with friction shifters. The chain goes into gear way smoother and you have to make less fine tune adjustments. I will never use a non-ramped freewheel again.