GP Sorenson is fine.
Your aftermarket choices are limited.
You've got Borg-Warner, which was a division of Dana, which sold the line to Standard Motor Products (SMP).
And, you've got Sorenson.
And, you've got AC Delco, which isn't actually made by Delco.
So, bottom line is, you're getting about the same thing, whichever route you take.
I've run plenty of Borg-Warner replacement sensors over the years, with no problems. I've also run SMP. It's just a matter of which Parts Store chain you go to, as they'll usually carry only two lines. One will be B-W, SMP, or GP Sorenson, and the other will be a branded line like AC Delco or Motorcraft.