I bought a new production Southard very recently...my third one. It was beautifully smooth to operate. Showed it to my college-age grand-daughter, who immediately relieved me of it. Well, I did give it to her, but she had her choice of that or a Domino or Dice. All manual flippers; differing blade-lengths, all very nice products.
For me, the choice is easy. No, I have NOT owned a Reate folder. I have read many good things about their products. However, here is the choice as I see it.
Very nice folder, G10 and titanium, great steel, smooth, weighs 116 gm or 4.1 ounces. Southard
Very good name, somewhat new (many creditable reports),weighs 155 gm or 5.5 ounces. Hills
Yes, you spotted it right away. One is 34% HEAVIER than the other.
My EDC for the last several yrs has been a 3.5" (0.140" blade-stock)_ CRK Umnumzaan, at 5.0 ounces...141.75 gm.
That five ounces is as heavy as I choose to carry. My carry needs are light-duty, although I did once use the blade to pry off a cast-iron lid from a pipe in order to turn off my water MAIN, during a home emergency. Some very small chipping from the S35VN blade-edge; easily and quickly repaired.
This abuse of my knife, with insignificant blade-edge damage, has proven to me that I don't need to carry a heavier knife.
When I look at new folders? First comes the 5-oz limit on weight...followed by many other factors.
This is THE right decision for ME. Other folks may certainly choose differently, based on other factors...
I wish you well. Both folders seem to be very good choices for many folks.