... but I am told the wheel bearings are only sealed on one side so I was originally thinking of replacing with two sided sealed bearing.
Sealed one side only??? (I read it on the internet, so it must be true)
Replacing the bearings at each tire change is cheap insurance, though may be overkill. Bearings seem to fail catastrophically.
Open bearings are good if you want speed (less friction drag from the seals)
Metal shielded is good to keep physical crap out (rocks and grit) Typically a "2MS" suffix in the bearing number.
Rubber shielded keep fluids out, usually water. Typically denoted with a "2RS" suffix in the bearing number.
Bearings are bearings, though some may disagree. Any quality bearing will work peachy. Major manufacturers are SKF, Fafnir, FAG (can you say that now?), Timken, and MANY others. "All balls" is marketing fluff IMNSHO, they don't make bearings last I checked.
Rick