i have a ton of fridges. oldest is an old metal case ARB thats about20 years old. still running stong ( but very inefficent) All the others use the same nidec compressor , bd-35f ( fromerly secop, formerly danfoss). so far i have an ironman, two smittybilts, new arb, indel-b, and a few china brands im testing. All preform about the same.. only major differences is the dimensions of each and what will fit your needs. The condenser and insulation of the body is what makes up the performance differences.
working with a few overseas companies , you will soon find out that 20 companies might sell the same looking fridge. Some are re-sellers and some actual manufactures. The big differences in the QC and testing that they do before the fridge is packaged,,and what after purchase support is available. almost all fridges can be repaired in minutes for most faults, with the exception of a freon leak.
the other big differences is the programming circuitry from company to company. I see some using relays to control the settings and some using mosfets. many are transitioning over to mosfets from relays. I can tell you the smittybilt i got this year has mosfets and the 4 year old one is relays. my arb is about 3 years old and has relays. ironman was also relays. Indel-b was mosfets.
there are other compressors is some of the brands i dont own yet with a swing style compressor which uses less moving parts and should be more reliable.
Just find somethign that fits your saize requirements and that you know will be around in years to come. also take a lok at warranty, if you have to ship it back for repair on your dime , it might not be worth it, some companies will walk you thru diagnostics and then ship you a repair part that can be changed in 1-2 minutes.