I looked at a 2014 G-550 last summer - this model has the naturally aspirated V8 gas engine. It only had 50,000 miles on it - which is pretty lightly used for a 2014. They wanted $71,000, and it eventually sold for $69,000. I thought pretty seriously about it as the G-Wagen was in a similar price range as the Grenadier. I'm not interested in spending $160,000 on a car, so a new G-Wagen wasn't ever a consideration (and the new ones don't have a solid front axle, so they are a pretty different vehicle).
Pros to the G-Wagen (from my perspective)
1. I prefer a naturally aspirated V8 over a forced induction 6-cylinder (even a straight 6).
2. The G-Wagen makes 360 horsepower, and 360 lb/ft of torque (both better than the gas Grenadier: 282 hp and 332 ft/lb).
3. Heated steering wheel (a huge plus when you live in a place that is often 40 or 50 degrees below freezing in the morning).
4. No "active safety systems" in the G-Wagen (which are standard in all 2024 Grenadiers in North America).
5. Front and rear diff locks engaged and disengaged much better than the Grenadier (at least on my test drives).
Pros to the Grenadier (from my perspective)
1. Manual transfer case.
2. Better on-road (less body roll in corners, more stable when making emergency maneuvers).
3. Better off-road (better articulation than the G-Wagen, which doesn't flex that well for a solid front axle vehicle).
4. More interior space.
5. Recaro seats.
6. But the biggest thing was this: it didn't seem to make sense to buy a 10-year old 4x4 with 50,000 miles on the clock for ~$70,000 when I could but a new Trialmaster for ~$80,000.