I think the installation technique plus vent positioning is 3/4 of the battle with the absorption fridges. Many RV mfrs and their assembly workers give little thought to the install recommendations of the fridge makers, and this often leads to poor performance. Possibly ETI has been more diligent in this regard, although I think I've seen a few (not too many) complaints on this forum in the past.
Of course, even a well-installed, properly operating absorption fridge will be slow to recover after it's been opened a few times. Compressor fridges will always win this battle. Compressor fridges can cool to a greater temp difference versus ambient than absorption units. And the compressor fridge will never have a pilot light get blown out by a strong wind or a big rig passing in the other direction.
Since ETI doesn't offer a compressor fridge in the 17', I only get to choose between 3 cu ft and 4 cu ft. Absent experiential feedback from Escape owners as to whether one will cool better than the other, I may have to flip a coin! But if it doesn't cool to my satisfaction, my backup idea is to buy a small, top-opening compressor fridge that can be plugged into 12V when the ambient temps prevent the built-in unit from doing its job. Some stuff isn't critical and can still ride in the absorption fridge, but I want my milk, meat, leftovers, etc. to stay plenty cool.