Tech and I are from the same school on the Watts linkage. It's the best way to keep the rear end centered in the car.

On a short wheelbase car, like 100" or less, I really prefer an unequal length 4 bar setup over the ladder bars. Makes for a bit more adjustability in the suspension, and with the inherent quick handling of a short wheelbase car IMO it's important to make the car handle good and go straight so you don't have to be doing a lot of correcting when you drive it....and as Tech stated, the heim joints aren't the right answer for street use...