Delta vs RJ (JFK to Amman)

Delta has recently started offering direct flights from JFK to Amman. Thus, ending Royal Jordanian's long monopoly over such routes.

did anybody try Delta? so far I found one review only. would appreciate more input. I'm trying to decide where to buy tickets for my upcoming trip.

so far:
1- Delta prices are about $300 below Royal Jordanian, which is a lot (~20% difference)
2- Delta is said to have a private security company that does "additional screening" on the ground at Amman airport. Passengers have to hand over their passports and answer questions to that company first, and THEN go to the Government passports line.
3- Delta, just like other American airliners, are said to provide very little leg space (compared to European & RJ flights). not sure if this is true.
4- Delta flights are also rumored to have much more American Government/Army Officials. RJ flights have more children :-)
5- No matter what one can say about RJ, they do have good delicious food. American Airliners usually do not... However, Delta must be loading food from Amman, so, not sure.

if anybody has more info, that would be great.