What other requirements do you have than an accounting system that's easy to use? What type of functionality would you be needing? And do you work with an accountant or bookkeeper?
Most accounting software providers offer free trials and I believe playing around with a couple of systems is probably the best way of finding out which one you find more user-friendly.
I work at the online accounting company E-conomic, and if you are looking at online systems, I would be happy if you would try out E-conomic and let me know what you think.