Having a JK wrangler 4 door and a Defender 130 in the family maybe I can add some value. Both vehicles have been reliable, The JK is a 2011 petrol model with 240,000 KM now and has the following bits:
Rhino roof Rack
ARB Bar 
2" lift with Bilstein shocks
265/70 Mickey Thompson STZ tyres on original rims (transformed the ride and handling)
When we did the Tassie trip we had a winch on the front which made a noticeable difference to the handling
We've done a 4wd trip to Tassie and can't fault it off road but with 2 Adults and two Kids it struggled to carry all our stuff, we worked around this by base camping and doing day trips but we took the transit sections pretty easy. What you say about the Wrangler's capability is pretty accurate with the few mods we have done it was easily as capable as the other vehicles on the trip which included Patrols, LC75s, Prados etc. The Jeep, like the Defender is an acquired taste and after you drive one you will love it or hate it but SWMBO loves hers and I don't mind it.
The Defender replaced a Disco3 and is a Feb 2016 delivery 130 Cab Chassis with the following bits:
ARB bar
Mulgo Ex Box
Winch ( from the Jeep)
Lots of Dynamat
Exhaust wrap
Stock Suspension
7"rims with Hankook muddies replacing the 6.5" wolf rims with MTRs
The Defender has done Maralinga, The Anne Beadell, Googs track as well as some High country touring. The setup I have with a removable pod allows us to carry everything we need without having to worry about load. The girls complain about the lack of rear legroom particularly now that they are teenagers but they survive. Out of the box it is not as capable as the Disco 3, proven on Macfarlaines track last Easter, failing to proceed where Disco 3s and 4s went and where I have driven my Disco 3 with no issues. Despite this it is a capable tourer and the only things I would add are a rear locker and maybe a sill tank (I used a 200ltr transfer tank on the desert trip, the luxury of being able to carry lots of stuff)
I would be happy to take either vehicle on just about any trip and the difference between them comes down to their daily use, SWMBO drives the Jeep every day but the Defender is mostly a farm truck and tourer and sits in the shed most of the week. I think driving it every day would probably get tiresome, particularly through Canberra traffic.
Attachment 143947
The rest of the convoy wasn't brave enough to follow us through here but we were keen.....
Attachment 143948
As Mentioned the Disco 3 and 4s made it up here but I ran out of traction.
Regards,
Tote