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OP there's no such thing as a "best" eyepiece - there are too many variables, and the criterion you wish to use is not defined, either (there are several).
The first variable is the scope - each telescope has its own set of aberrations and these can differ significantly. Eyepieces that are great in newtonians may not be ideal for refractors or SCT's.
Then there is the observer - some want lots of eye relief, some don't. Some value wider field over image quality (sharpness). Some obsess about image quality on-axis and don't care if it's terrible off-axis.
And for some "best" means cheapest, no matter what the image quality.
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