I can't handle it on "best for retina". I've been used to at least 1600x1200 since the late 1980s and 2560 across for the last few years on desktops.
For me the highest "standard" resolution (1920x1200) is usable for most purposes, occasionally switching to 2880x1800 for heavy use, photo editing, lots of windows. Although "best for retina" is very pretty, there's too little real estate to do anything useful.