Hap's second picture is a treat to the eye....nice work!
And it also points out the compromises that need to be considered with questions like this.
As Hap says, his car is super-stiff. This means there is less useable wheel travel (especially at non-racing speeds). So, the shorter, angled panhard rod allows a design that can focus on lowering roll center. The short rod may also push the axle left-right as it travels up and down, but that is less important, since the afformentioned wheel travel is pretty limited anyway. I have a friend who has a Lotus Seven with the same type of panhard rod.
I think that Seven has something like 700 in/lb springs in the back. /bcforum/images/%%GRAEMLIN_URL%%/shocked.gif
On semi-street cars (and my endurance racer) with softer springs and more wheel travel, the short rod might cause some weird side shifting in bumpy corners (although hopefully, race tracks have smoother corners).
So, going back to the original question, it depends on which way you want to compromise.
And I still like that wishbone deal too.....really a clever idea.
Speaking of clever ideas and roll-centers, one of the neatest Spridget axle setups is the live-axle Mumford link seen on Mallock race cars (below).
~CLICK HERE~ for more info on the Mumford link.