Size: height depth width.... Can be easy to miss one dimension. Energy rating - obvious reasons Noise depending on the room it's in Ergonomics - can you reach all the bits you need to... Imagine filling it with your weekly shop. - better energy rating=more insulation=less space. Doors can generally be reversed, but check. Some FFs have two compressor circuits, others only one. Can be important if keeping it in a garage. Do you need a water cooler/ice maker thing? More to clean, more to go wrong. YOUR FRIDGE DOES NOT NEED AN INTERNET CONNECTION Nor does it need funky windows & stuff Self defrost is a must. We spent ages discussing colour, now you can barely see it behind pictures & papers etc.

Think " is this a useful feature for me, or is it marketing fluff? "

Finally, while a fridge should be a long term purchase, is just a box that gets cold. Don't lose sleep over it.