I have seen a lot of Marshalls and senior members driving on Geolandar. I am sure they are great tyres for the sand and highway because the compound would be the softest amongst all the 4 options.
I am on Discoverer AT3 and I have been enjoying them for the past 3 years, compared to the stock tyres which were Grand Trek. On my AT3, I had 1 pop-out but it was due to panic and sudden left and right turn when I failed to cross a ridge and went into a soft patch of sand. The AT 3 are easy to balance and align and offer a pretty comfortable ride on the highway, not much difference compared to the stock Grand Trek.