The TWR effort was great, no one can deny that. Following on from the XJS's it was logical to use a European team for the step up into Grp C which at the time was pretty much a Europen team and TWR where the best available outfit at the time.
As far as the look of the grp 44 cars, its as simple as not really liking purple racing cars in my case, the Bud Lite and Castrol cars always pressed more buttons than the Silk cut ones, but the Grp 44 simple white and green is a classic.
The Grp 44 car was basic, all the cars where then, the original 956 was pretty straight forward in design. There is no telling what the Grp 44 team would have come up with next given a chance.
However the best thing about the Jags was noise, and that was the same no matter which side of the Atlantic it came from