I hate to sound snobby, but SnapOn is the best - at least their older ratchet and socket sets were quality from top to bottom. I have a ton of Wright and like it, same with Armstrong, Proto & SK,, but my older set SnapOn are my gotos.
The problem with SnapOn for a wrencher is they've become collectors and people buy them simply for 'investment' so the price is much higher than the others,, but you didn't ask about price, you asked what is the best American made ratchets.