I've been reading that certain scanners are capable of logging data that can be recorded while driving. What sort of data are most popular to be recorded? Can someone comment with examples of data logging capabilities out there today?
Scanners that can log things can generally log whatever they can also display.1
Also it wouldn't be unusual for a scanner that supports logging to let you choose what to log.
From an implementation perspective, it wouldn't really make any sense to make the set of loggable data be anything less than the complete set of readable / displayable data.
The real differences are e.g. how many parameters can be logged at once, or how often log entries can be written, or how long a log can be, or what format the logged data is in. For that you'll just have to check product description pages.
1 "Whatever they can display" may be a subset of all possible parameters -- this depends on the vehicle -- but in general if you can see it, you can log it.
It depends on what car you have - some cars provide data that other cars don't. It also depends on your scanner - some capture more data than others.
As a cheap way in, get a copy of Torque (for android or apple) and an ELM327 OBD transmitter (you'll need a bluetooth one for an apple). That pretty much captures everything, although you need to work a bit at it (e.g, knowing what you want to scan/graph really helps...)