Inline Hockey Skate Bearings typically feel fairly similar right out of the package, smooth, fast, quiet, with very little friction. What we feel separates them is how long they last overall with as little maintenance as possible. Currently, we find Bones bearings, especially the Swiss to hold up best. All of these are "standard" 608 sized bearings.
Don't forget to use spacers, which connect the bearings to the axle and ensures they will spin freely and prevent damage. What spacers you need will depend on the chassis you’re using – if you let us know what skate and chassis you have, we’ll let you know what kind of spacers you need.