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A bushing is a "bearing surface", but what you refer to as "solid bearings" are bushings
bearings aren't required in airsoft. The bushings and gear shafts are hardened so wear is very minimal.
The only time you need bearings is to increase ROF to ridiculous, or otherwise reduce friction to increase battery life. And then, you should only ever use kanzen bearings. A shitty G&P bearing, after wearing a bit, can be just as bad for your high fps gun as a plastic bushing.
The bigger the better. Smaller bearings yield higher max rpm, but you don't come anywhere near even being close to the max rpm of a bearing in the mechbox.
Larger bearings can easily handle greater angular stress, which is what you need.
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