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The model numbers correlate with the BTUs that they put out. The higher the number, the better the cooling of the unit itself.
XL and SB are just that, where they are made and sole. In the US, we have SB units where overseas they use XL units.
The cooling of the unit is important, but even more so is the trailer. If yu are in Saudi Arabia and you want a really cold unit, go with the SB 400, but make sure you have like a Utility 3000R trailer that has the thickest insulation. If you have thin insulation in the trailer, it will get the product hot in the trailer which will not do any good. You want a trailer that will keep the items in the rear (the warmest part of the trailer) as controlled as possible. For a really hot climate area, a dual controlled trailer might helo as well. This not only has the main unit in the front, but another small unit which is a fan and evaporator about 2/3 of the way back in the trailer. This way you can use a bulkhead in the middle to have frozen and refrigerated loads or to have the whole trailer in a deep freeze, like for ice cream which needs to be at -15 to -20 degress.
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