Inverter questions. Which one do you use and why?

I use the Yamaha EF2000iS

It is super durable and QUIET! lightweight... only 44 lbs. it generates up to 2000 W - it runs about 8 hrs at 50% load... there are options like the Champion 75531i that produce up to 3100 watts, but that model also weighs 80 lbs and only runs just over 4 hours per tank (@50% load).

Here is a good generator comparison chart